05000338/LER-1980-010-01, /01T-0:on 800111,during Review for IE Bulletin 79-14,S&W Found Stress on Vertical Rod Hangers SW-H-162A & SW-H-160A to Be Over Design Allowable.Caused by Incorrect Valve Weights Used in Pipe Support Design Calculations

/01T-0:on 800111,during Review for IE Bulletin 79-14,S&W Found Stress on Vertical Rod Hangers SW-H-162A & SW-H-160A to Be Over Design Allowable.Caused by Incorrect Valve Weights Used in Pipe Support Design Calculations

ML19257C492
Person / Time
Site:	North Anna
Issue date:	01/24/1980
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19257C480	List: 05000338/LER-1980-008-01, /01T-0:on 800111,during Review for IE Circular 78-08,S&W Found Control Room Air Conditioning Chiller Units Control Panel Not Qualified to Seismic Category I Requirements.Cause Unknown.Vendor Reviewing Components 05000338/LER-1980-010-01, /01T-0:on 800111,during Review for IE Bulletin 79-14,S&W Found Stress on Vertical Rod Hangers SW-H-162A & SW-H-160A to Be Over Design Allowable.Caused by Incorrect Valve Weights Used in Pipe Support Design Calculations ML19257C479
References
IEB-79-14, LER-80-010-01T, LER-80-10-1T, NUDOCS 8001290228
Download: ML19257C492 (2)

LER-1980-010, /01T-0:on 800111,during Review for IE Bulletin 79-14,S&W Found Stress on Vertical Rod Hangers SW-H-162A & SW-H-160A to Be Over Design Allowable.Caused by Incorrect Valve Weights Used in Pipe Support Design Calculations

Event date:
Report date:
3381980010R01 - NRC Website

text

NRC FORM 366 U. S. NUCLE AR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL ULOCK: l l

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8 60 61 DOCKET NUMBER 64 63 EVENT DATE 74 15 HEPORT DATE B0 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o

2 l On January ll, 19 80, during the review for IE Bulletin !9-14 Stone & Webster l discovered the stress on vertical rod hangers SW-H-162A and SW H-160A to be over I

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The hangers support the discharge piping of screen wash pumps I

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o s I l-SW-P-2 and 2-SW-P-2 respec t ively.

The health and safety of the general public were 1 l not af fected by this event.

Reportable pursuant to T.S. 6. 9.1. 8.1.

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Virginia Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Doc ke t No. 50-333 Report No. LER 80-010/01T-0

Description of Event

On January 11, 1980, during the review for IE Bulletin 79-14, Stone & Webster discovered vertical rod hangers SW-H-162A and SW-H-160A to be stressed over the design allowable.

The hangers support screen wash pump dishcarge lines 6"-WSSW-1-151-Q3 and 6"-WSSW-401-151-Q3, respectively.

Probable Consequences of Occurrence Because the hangers were overstressed, it was possible that the discharge piping of both the Unit 1 and Unit 2 screen wash pumps could have failed in the event of a seismic occurrence.

The health and safety of the general public were not af fected by this event.

No generic iraplications exist for this occurrence.

Cause of Event

The hangers were stressed over design allowable because incorrect valve weights were used in the design calculations of the supports.

The we igh t of the gate valve, immediately downstream of each pump, changed from 215 lbs. to 202 lbs.

Immediate Jorrective Action Both vertical rod hangers have been reinforced by replacing each hanger's tod with a strut.

Scheduled Corrective Action No scheduled corrective action is required.

Actions Taken to Prevent Recurrence No further actions are required.

1840 061'