ML18139A481

LER 80-041/03L-0:on 800625,pipe Stress re-analysis Indicated Baseplate Anchor Bolts on Hanger H-2 on Line 12 Inch -CC-27- 121 & Hanger H-9 on Line 12 inch-CC-33-121 Overstressed. Mods to Anchor Bolts Complete

ML18139A481
Person / Time
Site:	Surry
Issue date:	07/24/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
LER-80-041-03L-01, LER-80-41-3L-1, NUDOCS 8007280625
Download: ML18139A481 (2)

Text

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I o I 2 J I Pipe stress reanalysis by A.E. indicated baseplate Anchor Bolts on hanger H-2 on line IO j3 j 12 11 -CC-27-121 (Supplies Boron evaporator distillate coolers and overboard condenser IO J 4 J component cooling) and hanger H-9 on line 12 11 -CC-33-121 (takes discharge from waste Jo j s j I disposal evap. dist. cond.) are overstressed. This event is reportable in accordance Jo Js j jwith'-IE Bull'etin-79-02. The health and safety of 0 7 the public were not affected.

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0 I Stress reanalysis calculations indicated Baseplate Anchor Bolts overstressed.

Baseplates have been modified as required.

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,_ AITACHNE~T 1 SURRY PO~'iER STATION UNI.ie DOCKET NO: 50-280 REPORT NO: 80-041/03L-0 E"VENT DATE: 6-25-80 TITLE OF REPORT: EXCESSIVE STRESS ON BASEPLATE ANCHOR BOLTE, LINES 12"-CC-27-121 AND 12"-CC-33-121

1. Description of Event:

While continuing the program of reanalysis of pipe stress data it was revealed that two (2) supports were overstressed (exceeding 50% ultimate capacity). H-2 on line 12"-CC-27-121 (Supplies Boron evaporator distillata: coolers and over-board condenser component cooling) and H-9 on line.12"-CC-33-121 (takes discharge from waste disposal evap. dist. cond.). This event is repJrtable in accordance with IE Bulletin 79-02.

2. Probable Consequences and Status of Redundant Systems:

These lines are supplied from the component coolant pumps via the component coolant heat exchanger and discharge back to the header S1J?plying the component coolant pumps. Had a rupture occurred due to overstressed hangers, the possibility for partial loss of the Component Cooling System could hav~ existed. Under the' circumstances present, the health and safety of the public were not affected.

3. Cause of Event:

The Architect Engineer encountered this problem while conducting pipe stress re-analysis. The supports did not pass the safety factor of 2 due to inclusion of the flexibility factor. However, since the safety factor analysis without flexibility was not completed, the margin of original design was not deter.rrined.

4. Immediate Corrective Action:

The isolation valve to the main component cooling line was isolated; therefore, minimizing the effects.

5. Subsequent Corrective Action:

Since modifications have been made to eliminate the overstressed condition,: no subsequent action is required.

6. Future Corrective Action:

Analysis will continue and modifications will be made to r:=.lieve any overstress condition encountered.

7. Generic Implications:

Analysis continues to discover and rectify all overstressec conditions.