ML20084C751
| ML20084C751 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 08/27/1974 |
| From: | Carroll J JERSEY CENTRAL POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML20084C738 | List: |
| References | |
| AO-50-219-74-46, NUDOCS 8304080198 | |
| Download: ML20084C751 (4) | |
Text
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Jane O'iteilly
Dire rato of Reguistory Operations-p Region I
[',, l" 631iPark Avenue
. King of Prussia,, Pennsylvania 19406
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From:
Jersey: Central Power 6 Light Company.
Dyster Creek Nuclear Generating Station Docket #50-219 Forked River, New Jersey 08751 r
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Subject:
Abnormal Occurrence Report No. 50-219/74/46
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'the following is a preliminary report being submitted in compliance with.the Technical Specifications, r
a paragraph 6.6.2.
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Preliminary Approval:
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b 8/27/74'.'
J..T4 Carroll,1 Date
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Initial Telephone
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' Date of
- Report Date:. __
8/26/74 Occurrence:
8/26/ 74 Initial Written h
Time of Report Date:.
8/27/74 Occurrence:
1400 m.
.CYSTER CREEK. NUCLEAR ENERATING STATION PORKED RIVER, NEW JERSEY 08731 Abnormal Occurrence
- Report No. 50-219/74/ 46_
IDENTIFICAUIN Failure of one. torus to drywell vacuum breaker to demonstrate OF OCCURRENG:
, operability.
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'This event is considered to be an abnormal occurrence as de-
- fined.in. the Technic'ai Specifications, paragraph 1.1SD.
CONDIT1WS PRIOR x
Steady State Power Routine Shutdown TO OCCURRENCE:
Hot Standby Operation
/. Cold Shutdown Load Changes During Refueling Shutdown
, Routine Power ~ Operation
. Routine Startup Other (Specify)
Operation
'Ihe major plant parameters at the time of the event were as follows:
Power:
- Core, 1906 FWt
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> Electric, 636 FWe Flow:
Recirc.,15.4 X 104 gpm Feed., 7.17 X 106 lb/hr i
. Stack Gas:
13,175 pCi/sec M
DESCRIPTIW On Monday, August 26,1974, 'at approximately 1400, while per-0F OCCURRENG:
" forming surveillance testing on the 14 torus to drywell vacuum breakers, -it was found that one vacuum breaker (V-26-13) failed to demonstrate operability. Excessive force had to be applied to effect valve movement when V-26-13 was manually l
ened and closed.
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und-- ^ho influ:nce of grcvity alons t is noted hsro that V-26-15 was found to be scated prior to testing, as indicated by the recently installed valvo position indicating system.
The valve was setored'in.the closed position soon after t,his,
problem was identified.
APPARENT CAUSB x
Design Procedure OP OCCURRENCB:
Manufacture Unusual Service Condition Installation /
Inc.. Environmental Construction Component Failure Operator
___ Other (Specify)
It is believed that this failure is attributed to excess friction in the valve hinge pins.
ANALYSIS OF The-drywell-torus vacuum breaker system is required to prevent OCCURRENCE:
water oscillation in;the downcomers due to low steam flow rates in the downconers and to provido protection against negative pressure conditions in-the containment vessel. The. significance of this event is minimal in that-the bases of the Technical i
3 Specifications state that. one inoperative valve reduces the total vacuum relief' area by.7% and that about 25% of the avail-able vacuum relief capacity,is;r$ quired Io provide negative pressure protection.
'The drywell-torus vacuum breaker valves are required to be
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closed during pipe break accidents (particularly small breaks)
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to-ensure proper steam condensation.and. prevent torus overpres-suring. This valve would have performed this function, if re-quired.
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- .w with Q vacuum breskor valvo tsflengings'at.ssveral fac-111 ties, including Oyster Creek. 'the bushing difficulty has been discussed.with the valve manufacturer (Atwood 4 Norril!
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Company) and a proposal for a long-term solution is expected Eto be received from the manufacturer. within the next month.
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.* n.s s a It:is: noted here that. the bushings.in each torus to drywell
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p vacuum breaker valve were inspected and measured'during:.the
,19,74. refueling, outage.. Prior to valve reas'penbly, bushings
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in 11 of the 14 valves, including V-2613, were machined to
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- obtain acceptable bushing.I.D. - shaft 0.D.. clearances..
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_ _ _s.. se FAILURB DATA:
' B.asic valve data are as follows:
- Manufacturer - Atwood.6 Norrill m
Type - Check Valve-l7' Vent Area.- 1.75 square feet per valve,
- Previous abnomal occurrence repo'rts.il involving".;thehejvacuun
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Ibreaker valves.are::
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Abnomal,0ccurrence Report No. 73-2.
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Abnormal Occurrence Report No. 74-11
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Abnormal Occurrence Report No. 74;14.
44.. Abnomal Occurretice Report No.,74L15.,..
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.Se'.,,Abnormal Occurre.nce', Report No.: 7c,g-16..., m, E.9,.: q :.
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