diff --git a/apps/as/src/pages/design-cnstn/lib/button-config.ts b/apps/as/src/pages/design-cnstn/lib/button-config.ts
index 0f01d4f0d..2727092f2 100644
--- a/apps/as/src/pages/design-cnstn/lib/button-config.ts
+++ b/apps/as/src/pages/design-cnstn/lib/button-config.ts
@@ -43,48 +43,14 @@ const ROLE_USER01_ATRZ_STATUS_ACTIONS: Record<
   },
 };
 
-/**
- * Fork-Join (병렬 결재 6인 체제: 관로2 + 시설2 + 정책병합2) 전용 상태별 버튼 액션 매핑
- * - Stage 2: 관로/시설 실무검토자(ATRZ02), 부서승인자(ATRZ03)
- * - Stage 3: 정책총괄 종합병합자(ATRZ04), 최종회신자(ATRZ99)
- * - 일반 순차 결재 라인과 분리하여 독립적으로 관리
- */
-const ROLE_USER01_FORK_JOIN_ATRZ_STATUS_ACTIONS: Record<
-  string,
-  Record<string, DesignCnstnViewButtonAction[]>
-> = {
-  CT: {
-    ATRZ01: [DESIGN_CNSTN_VIEW_BUTTON_ACTION.rqstRvw],
-  },
-  CS: {
-    ATRZ02: [
-      DESIGN_CNSTN_VIEW_BUTTON_ACTION.rvwStrg,
-      DESIGN_CNSTN_VIEW_BUTTON_ACTION.rvwCmptn,
-    ],
-    ATRZ03: [DESIGN_CNSTN_VIEW_BUTTON_ACTION.atrzRply], // Stage 2 부서승인 ➔ 병합에 회신
-    ATRZ04: [DESIGN_CNSTN_VIEW_BUTTON_ACTION.atrzAprv], // Stage 3 정책총괄 ➔ 병합
-    ATRZ99: [DESIGN_CNSTN_VIEW_BUTTON_ACTION.atrzRply], // Stage 3 정책총괄 ➔ 최종 회신
-  },
-  CP: {},
-};
-
 function resolveButtonConfigs(
   actions: DesignCnstnViewButtonAction[],
 ): DesignCnstnViewButtonAction[] {
   return actions.map((action) => DESIGN_CNSTN_VIEW_BUTTON_ACTION[action]);
 }
 
-const PENDING_APPROVAL_ACTIONS = new Set<DesignCnstnViewButtonAction>([
-  DESIGN_CNSTN_VIEW_BUTTON_ACTION.rvwCmptn,
-  DESIGN_CNSTN_VIEW_BUTTON_ACTION.atrzAprv,
-  DESIGN_CNSTN_VIEW_BUTTON_ACTION.atrzRply,
-]);
-
-export interface GetButtonConfigsOptions {
+interface GetButtonConfigsOptions {
   hasPendingApprovalRequest?: boolean;
-  isForkJoin?: boolean;
-  branchSeCd?: string;
-  branchSttsCd?: string;
 }
 
 function resolveRoleUser01AtrzButtonActions(
@@ -92,25 +58,11 @@ function resolveRoleUser01AtrzButtonActions(
   atrzSeComCdList: string[],
   options?: GetButtonConfigsOptions,
 ): DesignCnstnViewButtonAction[] {
-  let effectiveStatus = prgrsSttsComCd;
-
-  if (options?.isForkJoin && options?.branchSttsCd) {
-    switch (options.branchSttsCd) {
-      case "SUPPLEMENT":
-        return [];
-      case "COMPLETED":
-        return [];
-      case "WAITING":
-        return [];
-      case "IN_PROGRESS":
-        effectiveStatus = "CS";
-        break;
-    }
+  if (prgrsSttsComCd === "CS" && options?.hasPendingApprovalRequest === false) {
+    return [];
   }
 
-  const atrzStatusMap = options?.isForkJoin
-    ? ROLE_USER01_FORK_JOIN_ATRZ_STATUS_ACTIONS[effectiveStatus]
-    : ROLE_USER01_ATRZ_STATUS_ACTIONS[effectiveStatus];
+  const atrzStatusMap = ROLE_USER01_ATRZ_STATUS_ACTIONS[prgrsSttsComCd];
   if (!atrzStatusMap || atrzSeComCdList.length === 0) return [];
 
   const seen = new Set<DesignCnstnViewButtonAction>();
@@ -127,11 +79,7 @@ function resolveRoleUser01AtrzButtonActions(
     }
   }
 
-  return actions.filter((action) => {
-    const needsPendingApproval = PENDING_APPROVAL_ACTIONS.has(action);
-    if (needsPendingApproval && options?.hasPendingApprovalRequest === false) return false;
-    return true;
-  });
+  return actions;
 }
 
 export function needsRoleUser01AtrzResolve(
diff --git a/apps/as/src/pages/design-cnstn/lib/design-cnstn-regist-schema.ts b/apps/as/src/pages/design-cnstn/lib/design-cnstn-regist-schema.ts
index a0218d61c..a5dda2d38 100644
--- a/apps/as/src/pages/design-cnstn/lib/design-cnstn-regist-schema.ts
+++ b/apps/as/src/pages/design-cnstn/lib/design-cnstn-regist-schema.ts
@@ -62,26 +62,3 @@ export function parseTaskSeComCdFromApi(taskSeComCd?: string | null): string[] {
   if (!taskSeComCd) return [];
   return taskSeComCd.split(",").filter(Boolean);
 }
-
-/**
- * 설계자문 저장 시 코드가 "SF,SP", "SP,SF" 등의 복수 코드로 분리 저장된 경우,
- * 전자결재 복합병렬결재(Fork-Join) 화면 및 프로세스 규격에 맞춰 "SF_SP"로 정규화합니다.
- */
-export function normalizeTaskSeComCdForElapr(taskSeComCd?: string | null): string {
-  if (!taskSeComCd) return "";
-  const trimmed = taskSeComCd.trim();
-  if (trimmed === "SF_SP") return "SF_SP";
-
-  const codes = trimmed.split(",").map((c) => c.trim()).filter(Boolean);
-  if (codes.includes("SF") && codes.includes("SP")) {
-    return "SF_SP";
-  }
-  return trimmed;
-}
-
-/**
- * 전자결재 복합병렬결재(Fork-Join) 대상 업무 여부 판단
- */
-export function isForkJoinTask(taskSeComCd?: string | null): boolean {
-  return normalizeTaskSeComCdForElapr(taskSeComCd) === "SF_SP";
-}
diff --git a/apps/as/src/pages/design-cnstn/ui/components/floating-action-buttons.tsx b/apps/as/src/pages/design-cnstn/ui/components/floating-action-buttons.tsx
index 025fcb98f..94088f228 100644
--- a/apps/as/src/pages/design-cnstn/ui/components/floating-action-buttons.tsx
+++ b/apps/as/src/pages/design-cnstn/ui/components/floating-action-buttons.tsx
@@ -23,7 +23,6 @@ import {
   type ElaprTmpltPickerConfirmPayload,
   ElaprTmpltPickerDialog,
   hasCurrentUserPendingApprovalRequest,
-  useElaprBranchesByDocNo,
   useElaprDocPrgrsByDocNo,
 } from "@/entities/elapr";
 import { Button } from "@common/components";
@@ -34,10 +33,6 @@ import {
   getButtonConfigs,
   needsRoleUser01AtrzResolve,
 } from "../../lib/button-config";
-import {
-  isForkJoinTask,
-  normalizeTaskSeComCdForElapr,
-} from "../../lib/design-cnstn-regist-schema";
 import { buildSavePayload, buildTechReviewPayload } from "../../lib/save-payload-utils";
 import type { TechReviewOpinionSectionHandle } from "../sections/tech-review-opinion-section";
 
@@ -77,92 +72,31 @@ function FloatingActionButtons({
   const docNo = data.detDto?.designCnstnDocNo ?? designCnstnDocNo;
   const isRegister = data.detDto?.rgtr === userInfo?.userUnqId;
 
-  const normalizedTaskSeComCd = normalizeTaskSeComCdForElapr(data.detDto?.taskSeComCd);
-  const isForkJoin = isForkJoinTask(data.detDto?.taskSeComCd);
-
   const needsAtrzResolve = needsRoleUser01AtrzResolve(dtlInstCd, prgrsSttsComCd);
   const needsCsApprovalCheck = needsAtrzResolve && prgrsSttsComCd === "CS";
   const { data: elaprDocPrgrsList = [], isLoading: isElaprDocPrgrsLoading } =
     useElaprDocPrgrsByDocNo(needsCsApprovalCheck ? docNo : null);
-  const { data: elaprBranchList = [], isLoading: isElaprBranchLoading } =
-    useElaprBranchesByDocNo(needsCsApprovalCheck && isForkJoin ? docNo : null);
 
   const hasPendingApprovalRequest = hasCurrentUserPendingApprovalRequest(
     elaprDocPrgrsList,
     userInfo?.userUnqId,
   );
 
-  const currentUserPrgrsRow = elaprDocPrgrsList.find(
-    (row) => row.aprvrUuid?.toLowerCase() === userInfo?.userUnqId?.toLowerCase(),
-  );
-  const userPendingPrgrs = elaprDocPrgrsList.find(
-    (row) =>
-      row.aprvrUuid?.toLowerCase() === userInfo?.userUnqId?.toLowerCase() &&
-      row.atrzPrgrsSttsComCd === "ATRZ_PRGRS_002",
-  );
-  const userBranchId = userPendingPrgrs?.branchId ?? currentUserPrgrsRow?.branchId;
-  const userBranchSeCd = (userPendingPrgrs?.branchSeCd ?? currentUserPrgrsRow?.branchSeCd) as
-    | "SP"
-    | "SF"
-    | "TOTAL_AGG"
-    | "MAIN"
-    | undefined;
-  const userPendingBranchSeCd = userPendingPrgrs?.branchSeCd ?? userBranchSeCd;
-  const userPendingAtrzSeComCd = userPendingPrgrs?.atrzSeComCd;
-
-  const effectiveAtrzSeComCdList = useMemo(() => {
-    if (isForkJoin && userPendingAtrzSeComCd) {
-      return [userPendingAtrzSeComCd];
-    }
-    if (isForkJoin && currentUserPrgrsRow?.atrzSeComCd) {
-      return [currentUserPrgrsRow.atrzSeComCd];
-    }
-    return atrzSeComCdList;
-  }, [atrzSeComCdList, currentUserPrgrsRow?.atrzSeComCd, isForkJoin, userPendingAtrzSeComCd]);
-
-  const userBranchSttsCd = useMemo<string | undefined>(() => {
-    if (!isForkJoin || !userBranchSeCd) return undefined;
-
-    const matchedBranch = userBranchId
-      ? elaprBranchList.find((b) => b.branchId === userBranchId)
-      : elaprBranchList.findLast((b) => b.branchSeCd === userBranchSeCd);
-    if (matchedBranch?.branchSttsCd) {
-      return matchedBranch.branchSttsCd;
-    }
-
-    if (prgrsSttsComCd === "CS") {
-      return "IN_PROGRESS";
-    }
-    if (prgrsSttsComCd === "CP") {
-      return "COMPLETED";
-    }
-
-    return undefined;
-  }, [elaprBranchList, isForkJoin, prgrsSttsComCd, userBranchId, userBranchSeCd]);
-
   const actionButtons = useMemo(() => {
     if (needsAtrzResolve && isRvwLoginUserLoading) return [];
     if (needsCsApprovalCheck && isElaprDocPrgrsLoading) return [];
-    if (isForkJoin && isElaprBranchLoading) return [];
-    return getButtonConfigs(dtlInstCd, prgrsSttsComCd, effectiveAtrzSeComCdList, {
+    return getButtonConfigs(dtlInstCd, prgrsSttsComCd, atrzSeComCdList, {
       hasPendingApprovalRequest: needsCsApprovalCheck ? hasPendingApprovalRequest : undefined,
-      isForkJoin,
-      branchSeCd: userBranchSeCd,
-      branchSttsCd: userBranchSttsCd,
     });
   }, [
+    atrzSeComCdList,
     dtlInstCd,
-    effectiveAtrzSeComCdList,
     hasPendingApprovalRequest,
-    isElaprBranchLoading,
     isElaprDocPrgrsLoading,
-    isForkJoin,
     isRvwLoginUserLoading,
     needsAtrzResolve,
     needsCsApprovalCheck,
     prgrsSttsComCd,
-    userBranchSeCd,
-    userBranchSttsCd,
   ]);
 
   const canEdit =
@@ -257,9 +191,6 @@ function FloatingActionButtons({
       dmndCn: data.detDto?.bizCn ?? "",
       elaprCycl: 1,
       docPrgrsSttsComCd: data.detDto?.prgrsSttsComCd,
-      taskSeComCd: normalizedTaskSeComCd,
-      forkJoinSeCd: isForkJoin ? "FORK_JOIN" : "NONE",
-      crntStageNo: isForkJoin ? 2 : 1,
       elaprPrgrsSttsList: buildElaprPrgrsSttsListFromAplnRows(aplnRows),
     };
     await executeAction({
@@ -270,11 +201,6 @@ function FloatingActionButtons({
     await queryClient.invalidateQueries({
       queryKey: [ENDPOINT.AS_ELAPR_SERVICE.ELAPR_DMND, "findDocPrgrsByDocNo", docNo],
     });
-    if (isForkJoin) {
-      await queryClient.invalidateQueries({
-        queryKey: [ENDPOINT.AS_ELAPR_SERVICE.ELAPR_BRANCH, "findBranchesByDocNo", docNo],
-      });
-    }
   }
 
   async function handleRvwStrgClick() {
@@ -355,33 +281,16 @@ function FloatingActionButtons({
               검토완료
             </Button>
           )}
-          {shouldShowButton(DESIGN_CNSTN_VIEW_BUTTON_ACTION.atrzAprv) &&
-            (!isForkJoin ||
-              (userPendingBranchSeCd === "TOTAL_AGG" && userPendingAtrzSeComCd === "ATRZ04")) && (
-              <Button onClick={() => setActiveDialog("elaprApproval")} disabled={isProcessing}>
-                {isForkJoin ? "결재 (병합)" : "결재(승인)"}
-              </Button>
-            )}
-          {shouldShowButton(DESIGN_CNSTN_VIEW_BUTTON_ACTION.atrzRply) &&
-            (!isForkJoin ||
-              (userPendingBranchSeCd !== "TOTAL_AGG" && userPendingAtrzSeComCd === "ATRZ03") ||
-              (userPendingBranchSeCd === "TOTAL_AGG" && userPendingAtrzSeComCd === "ATRZ99")) && (
-              <Button
-                color={
-                  isForkJoin && userPendingBranchSeCd !== "TOTAL_AGG"
-                    ? "green"
-                    : undefined
-                }
-                onClick={() => setActiveDialog("elaprApproval")}
-                disabled={isProcessing}
-              >
-                {isForkJoin
-                  ? userPendingBranchSeCd === "TOTAL_AGG"
-                    ? "결재 (환경청에 회신)"
-                    : "결재 (병합에 회신)"
-                  : "결재(회신)"}
-              </Button>
-            )}
+          {shouldShowButton(DESIGN_CNSTN_VIEW_BUTTON_ACTION.atrzAprv) && (
+            <Button onClick={() => setActiveDialog("elaprApproval")} disabled={isProcessing}>
+              결재(승인)
+            </Button>
+          )}
+          {shouldShowButton(DESIGN_CNSTN_VIEW_BUTTON_ACTION.atrzRply) && (
+            <Button onClick={() => setActiveDialog("elaprApproval")} disabled={isProcessing}>
+              결재(회신)
+            </Button>
+          )}
         </div>
       </div>
 
@@ -389,27 +298,18 @@ function FloatingActionButtons({
         open={activeDialog === "elaprTmplt"}
         onClose={() => setActiveDialog(null)}
         docSeComCd={docSeComCd}
-        taskSeComCd={normalizedTaskSeComCd}
         onConfirm={handleElaprTmpltConfirm}
       />
 
       <ElaprApprovalDialog
         open={activeDialog === "elaprApproval"}
         onOpenChange={(open) => setActiveDialog(open ? "elaprApproval" : null)}
-        elaprDocNo={docNo}
+        elaprDocNo={data.detDto?.designCnstnDocNo ?? designCnstnDocNo}
         currentUserUuid={userInfo?.userUnqId ?? ""}
         onSuccess={() => {
           queryClient.invalidateQueries({
             queryKey: designCnstnKeys.detail(designCnstnDocNo),
           });
-          queryClient.invalidateQueries({
-            queryKey: [ENDPOINT.AS_ELAPR_SERVICE.ELAPR_DMND, "findDocPrgrsByDocNo", docNo],
-          });
-          if (isForkJoin) {
-            queryClient.invalidateQueries({
-              queryKey: [ENDPOINT.AS_ELAPR_SERVICE.ELAPR_BRANCH, "findBranchesByDocNo", docNo],
-            });
-          }
         }}
       />
     </>
diff --git a/apps/as/src/pages/design-cnstn/ui/design-view-page.tsx b/apps/as/src/pages/design-cnstn/ui/design-view-page.tsx
index 28395247a..906d9172c 100644
--- a/apps/as/src/pages/design-cnstn/ui/design-view-page.tsx
+++ b/apps/as/src/pages/design-cnstn/ui/design-view-page.tsx
@@ -13,7 +13,6 @@ import { AttachmentsViewSection, ProgressStatusSection } from "@/widgets/pbadms-
 import { Button, cn, Skeleton } from "@common/components";
 
 import { needsRoleUser01AtrzResolve } from "../lib/button-config";
-import { normalizeTaskSeComCdForElapr } from "../lib/design-cnstn-regist-schema";
 import { getEditableReviewStep } from "../lib/review-step-utils";
 import { PROGRESS_STATUS_COLUMNS } from "../model/columns";
 
@@ -109,10 +108,7 @@ function DesignViewPage({ id }: DesignViewPageProps) {
           />
           <BasicInfoSection det={detDto} />
           <ContactInfoSection det={detDto} />
-          <ElaprDocPrgrsStatus
-            elaprDocNo={detDto.designCnstnDocNo}
-            taskSeComCd={normalizeTaskSeComCdForElapr(detDto.taskSeComCd)}
-          />
+          <ElaprDocPrgrsStatus elaprDocNo={detDto.designCnstnDocNo} />
           <BusinessScaleSection bizSclList={bizSclList} />
           <AttachmentsViewSection esntlFileList={esntlFileList} etcFileList={etcFileList} />
           <TechReviewOpinionSection