ML19339C766

LER 80-078/01T-0:on 801030,review of Results of Salt Svc Water Sys Per IE Bulletin 79-14,indicated Design Deficiency. Caused by Installation of Salt Svc Water Anchor Point Outside Area Tornado Missile Barrier Protection

ML19339C766
Person / Time
Site:	Pilgrim
Issue date:	11/13/1980
From:	Mcloughlin M BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19339C765	List: ML19339C764 ML19339C766
References
IEB-79-14, LER-80-078-01T, LER-80-78-1T, NUDOCS 8011190411
Download: ML19339C766 (2)

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,10121 l On October 30, 1980 the ORC reviewed the results of an ann 1vn4n nf eko 9,le l

.[O la l i Service Water System conducted in response to IE Bulletin 79-14. The results l 7;g [ indicated that a design deficien-y existed because of the installation of a SSW l LO t s l l anchor point outside the area's tornado missile barrier protection. (Refer to 1 IO is I l attachment for additional details). I 10171 l I 10!81I l 7 8 9 80 E COE SUSCODE CCMPONENT CCOE SL8 CODE SU E lOl9l l C l F l h Wh l A l h l S l N l P l 0 l R I T lh l X lh [2,,,) h ' :"

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BOST01: EDISON COMPAhT ,

PILGRIM h'JCLEAR POWER STATION '

DOCKET NO. 50-293

-Attachment to LER 80-078/0lT-0 Description On October 30, 1980, tha ORC reviewed the results of an analysis of the Salt Service Water (SSW) System conducted in response to IE Bulletin 79-14.

The review indicated that the original seismic analysis for the Salt Service Water System took credit for a seismic anchor located beyond the outboard isolation valves. The seismic anchors in this case are the screen wash pumps.

However, recent analyses for adequate tornado missile protection has revealed that this anchor point extends beyond the missile protected area, thereby jeopardizing operability of the SSW should a tornado induced missile impact at this anchor point.

To permit continued reactor operation until a modification of the SSW system could be implemented, which would preclude adverse consequence from this remote, postulated event, a " Request for Immediate Relief from Technical Specification 3.5.B", was requested and received.

Cause and Corrective Action As an interim measure, a temporary operating procedure had been implemented and remained in effect until these modifications were completed. This procedure i required the facility to be immediately shut down in the event a Tornado Warning l in the immediate area is issued.

Analysis indicet>< that the permanent correction action would be to relocate the seismic anchors ' side the tornado barriers. These mdofications were completed on November 6, 1980.

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