ML20028B042

LER 82-049/01T-0:on 821102,main Steam Line Safety Valve a Set W/Nitrogen at Steam Relief Setting of 1240 Psig, Exceeding Tech Specs.Caused by Personnel Error.Set Valve Removed,Procedure Adherence Stressed & Procedure Revised

ML20028B042
Person / Time
Site:	Pilgrim
Issue date:	11/16/1982
From:	Whitney G BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20028B036	List: ML20028B035 ML20028B042
References
LER-82-049-01T, LER-82-49-1T, NUDOCS 8211290396
Download: ML20028B042 (2)

Text

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NRC FORM 366 U. S. NUCLEA3 EEGULATtRY COMMISSION (7 77)

LICENSEE EVENT REPORT ,

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7 8 80 81 DOCKET NUM8ER 88 89 EVENT DATE EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h g l On 11/2/82, during steady state operations, documentation review indicated that the / .

g g"A" Main Steam Line safety valve had been set with nitrogen at the steam relief settin'g

,(1240 psig). This setting could have permitted operation above the LSSS limit speci hl

fied in T.S. section 2.2.c. An immediate plant shutdown was instituted and drywell\l l 0 l6 l l entry was made following de-inerting. The NRC was notified via ENS. No challennes I ga;,;lto the valves have occurred, therefore this event caused no t!hreat to the public l

, o ,, i g health and safety. l E CODE S SC E COMPONENT CODE SUB ODE SU E

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47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h i O l Personnel error is the cause of this event. The installed valve was removed, replaced g lwith a properly set spare valve, and the system returned to normal. The removed 1

,, ,,, Ivalve will be sent to a testing lab to determine the actual "as-found" setting. I g l Proper adherence to procedures was stressed to the appropriate personnel and Il i 4 l procedure revisions were made immediately to preclude recurrence. l 7 8 9 80 ST  % POWER OTHER STATUS I RY DISCOVERY DESCRIPTION g W@ l1 l 0 l 0 l@l NA l l D [gl ANI Inspector review l A TiVITY CO TENT RELEASED OPRELEASE AMOUNT OP ACTIVITY LOCATION OP RELEASE lYI6l l Z l h l Zj@l 10 NA 44 l l 45 NA 80 l

7 8 9 11 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION NA l

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~ BOSTON EDISON COMPANY PILGRIM NUCLEAR POWER STATION -

, DOCKET NO. 50-293 .

Attachment to LER[82-049 e

On 11/2/82,'following an ANI Inspector's review of procedure's used regarding main steam line safety valves, it was determined that the "A" safety valv'e had been set with nitrogen at the steam setting of 1240 psig. It was concluded .

that if the valve had been required to relieve steam, the relief'could have.

occurred.above the LSSS specified in T.S. Sec'tiour 2.2.c.

.The valve *had been bench tested at this pressure relief on 3/1/82 and installed using procedure 3.M.4-7. ~The valve is a Cqnsolidated Safety Valve supplied'by Dresser Industrial Valve and Instrument Division, type 3777QA-RT-21 serial g o ' number BK 6262. The high and low steam nameplate settings are 1240 and 1235 - -

psig respectively while the nitrogen settings are 1150 ,and 1125 psig respectively.

Immediately upon learning of the discrepancy, a plant shutdown was initiated.

. Drywell de-inerting commenced and entry was made to remove the valve and replace it with a properly set and tested spare valve. The removed valve will be sent to a testing lab to determine the actual "as-found" steam relief setting.

. Personnel error compounded by procedural inconsistency is the cause of th.is event. . Subsequent to the discovery of the erroneous setting, a maintenance

. department meeting was held that same day. The importance of proper adherence to-written procedures,was stressed, and appropriate. personnel counseled. In addition, in order to preclude a recurrence, a prompt review lEl Procedure 3.M.4-7 was per-formed and changes to the check-off sheet to eliminate the inconsistency were immediately initiated with a complete revision to be made to clarify the intended test procedure.

The unit was placed on line at 0120 on,11/5/82.

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