05000281/LER-1978-034-03, /03L-0:on 781006,w/unit at Cold Shutdown,Snubbers 2-RH-HSS-20 & 2-WFPD-HSS-9 Inoperable.Caused by Low Fluid Level.Defective Snubbers Dry Because of Leaking Rod Seals & Mechanical Damage to Seals.Snubbers Replaced

/03L-0:on 781006,w/unit at Cold Shutdown,Snubbers 2-RH-HSS-20 & 2-WFPD-HSS-9 Inoperable.Caused by Low Fluid Level.Defective Snubbers Dry Because of Leaking Rod Seals & Mechanical Damage to Seals.Snubbers Replaced

ML18113A594
Person / Time
Site:	Surry
Issue date:	10/31/1978
From:	Baucom T VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML18113A593	List: 05000281/LER-1978-034-03, /03L-0:on 781006,w/unit at Cold Shutdown,Snubbers 2-RH-HSS-20 & 2-WFPD-HSS-9 Inoperable.Caused by Low Fluid Level.Defective Snubbers Dry Because of Leaking Rod Seals & Mechanical Damage to Seals.Snubbers Replaced 05000281/LER-1978-035-03, /03L-0:on 781007,during Cold Shutdown,Valve Pit Flooded While Draining Circulating Water Box D.Caused by Damage of Valve from Flooding ML18113A591
References
LER-78-034-03L, LER-78-34-3L, NUDOCS 7811060213
Download: ML18113A594 (2)

LER-1978-034, /03L-0:on 781006,w/unit at Cold Shutdown,Snubbers 2-RH-HSS-20 & 2-WFPD-HSS-9 Inoperable.Caused by Low Fluid Level.Defective Snubbers Dry Because of Leaking Rod Seals & Mechanical Damage to Seals.Snubbers Replaced

Event date:
Report date:
2811978034R03 - NRC Website

text

NRC FORM 36n (7*7J~

u, s. NUCLEAR REGULATORY COMMISSION. --

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• 1 s 10 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES (10) j With unit 2 t cold shutdown, snubbers Y-RH-HSS-20 and 2-WFPD-HSS-9 were found inoperable!

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I on the end-of-interval inspection.

The units were inoperable because of low fluid *

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'I:-.:..s conditio:i is contrary to T.S. 3.20.A and is reportable in accordance with T.S. 6.6.:.~.(2).

~22 health and safety of the public were not affected.

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I The defec--'*- 0 s------~.:o.~s were dry because of leaking rod sea1s. The seals were EP materi-1 Lili] I al and had '=>:::*.-=-d C""' to mechanical damage to the seal~_ The* inoperable snubbers CIII] I were replaced wic:2 snop spares.

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(Attachment,*Page 1 ~l)

Surry Power Station, Unit 2 Docket No: 050-0281 Report No: 78-034/03L-0 Event Date:

10-6-78 Snubber Inspection Results

1.

Description of Event

~ith the unit at cold shutdown, snubbers 2-RH-HSS-20 and 2-WFPD-HSS-9 were ietermined to be inoperable by the end-of-interval inspection.

The s~ub~2rs had no detectable fluid level.

This condition is contrary to Te~tc_i=al Speci=ication 3.20.A and is reportable in accordance with Technical S?eci=i~ation 5.6.~.b.(2).

~-=-

-,--c.::.cc----:_--=----=-s of an inoperable snubber is an increase in the probability o:;: 0::-----,--:::"'.-==-=::,:.::.

-':J piping as a result of seismic or other event initiating dyn;::-- - - -:=-=:o.

.::-----j.=.~ protection is required only during a low probability of eve::::~, ::::2::--2:=':.-::-2~ =~-:e total loss of suppressor fluid from 2-RH-HSS-20 and 2-HF~=-=.3:::-; ~:: :-_,:: effect upon the health and safety of the general public.

3.

Cause --.::.-.-==.:::

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the low fluid level was leaking rod seals on both snubbers.

The s"'--=-=--=- -,,e:::-'= :i:::::?.:.aterial and had suffered mechanical damage, rather than aging -2.:'=2*::::5 :='::-o::i radiation or heat.

4.

Immedia::e C8::-r2~tive Action:

7:i:::e failed snubbers were replaced with shop spares.

5.

Scheduled Corrective Action:

1-io further corrective actions are scheduled at this time.

6.

Action Taken to Prevent Recurrence:

Present intentions are to replace the "as found" inoperable snubbers with Q.C. accepted operable snubbers.

7.

Generic Implications:

Leaking of snubber fluid is a problem, inherent to hydraulic systems, maintained within safe bounds by periodic inspection and routine maintenance.

The loss of reservoir fluid, as in the case of hydraulic snubbers 2-RH-HSS-20 and 2-HFPD-HSS-9, is not considered a.generic problem because of the infrequency of such occurrence,at these snubber locations.