ML19260C706

LER 79-064/03L-0:on 791205,during Surveillance Test on Class 1 Hydraulic Snubbers,Three Snubbers Found Inoperable & Two Installed W/Incorrect Orientation.Caused by Piston Ring Being Out of Tolerance on One Snubber

ML19260C706
Person / Time
Site:	Fort Saint Vrain
Issue date:	01/02/1980
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19260C703	List: ML19260C702 ML19260C706
References
LER-79-064-03L, LER-79-64-3L, NUDOCS 8001080480
Download: ML19260C706 (1)

Text

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NRC PORM'366 U,S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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7 8 60 61 DOCKET NUMBER 68 69 EVENT QATE 74 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l While the reactor was shutdown for scheduled maintenance, surveillance test on Class Il o a i hydraulic snubbers identified three inoperable snubbers. Reactor operation had taken l o 4 l place during surveillance interval. Interpreted as operation under a degraded mode l o s permitted by LCO 4.3.10 and reportable per Technical Specification '.C 7.5.2(b)2. No l o s~ ] accompanying occurrance. No effect on public health or safety. l 0 7 l l o Ia l I 7 8 9 80 C DE CC E SUBC E COMPCNENT CODE SUSCCC'E SU E O 9 lZ lZ @ @ [Zj @ [S U j P l 0 l R [ T l@ lD [@ lZ l @ 20 7 8 9 10 11 13 18 19

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a 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l Three ITT Grinnel Figure 200 and 201 snubbers inoperable. One oiston was out of I g I tolerance due to thermal movement. Two installed with incorrect orientation of oil 1

[, 7 l reservoir / snubber valve. Adjusted to bring piston in tolerance. Re-installed with l p 3 correct orientation. Maintenance Procedure revised to provide orientation verificatiqn.

i 4 1 l 7 8 9 80 ST  % POWER OTHER STATUS IS O RY DISCOVERY DESCRIPTION i s Gl@ l 0 l 0 l 0 l@l N/A l lBl@l Surveillance Test l ACTIVITY CC TENT RELEASED OF RELEASE AMCUNT OF ACTIVITY LOCATION OF RELEASE 1 6 l Zl @ l Z l@l N/A l l N/A l 7 8 9 to 11 44 45 80 PERSONNEL EXPOSURES NUM8ER TYPE D ESCRIPTION 1

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