diff --git a/src/main/resources/mappers/pwrGnrSimulation/pwrGnrSimMapper.xml b/src/main/resources/mappers/pwrGnrSimulation/pwrGnrSimMapper.xml
index af2e597e..bdad080d 100644
--- a/src/main/resources/mappers/pwrGnrSimulation/pwrGnrSimMapper.xml
+++ b/src/main/resources/mappers/pwrGnrSimulation/pwrGnrSimMapper.xml
@@ -81,7 +81,12 @@
                  , B.ITEM_ID
                  , SUM(B.AMOUNT) AS AMOUNT
                  , B.ITEM_NO
-                 , ISNULL((SUM(B.AMOUNT) * TRY_CAST(MAX(B.SPECIFICATION) AS FLOAT)),0) AS TOT_SPECIFICATION /* 용량 */
+                 , ISNULL((SUM(B.AMOUNT) *
+                           CASE
+                               WHEN ISNUMERIC(MAX(B.SPECIFICATION)) = 1 THEN CAST(MAX(B.SPECIFICATION) AS FLOAT)
+                               ELSE NULL -- 또는 기본값 (예: 0)으로 대체할 수도 있음
+                               END
+                              ),0) AS TOT_SPECIFICATION /* 용량 */
                  , MAX(C.ITEM_GROUP) AS ITEM_GROUP /* 추후 지붕재테이블로 봐야함. */
                  , MAX(D.TEMP_LOSS) AS TEMP_LOSS
                  , MAX(D.TEMP_COEFF ) AS TEMP_COEFF