05000278/LER-1979-011, Forwards LER 79-011/01T-0

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Forwards LER 79-011/01T-0
ML19263D727
Person / Time
Site: Peach Bottom Constellation icon.png
Issue date: 04/06/1979
From: Cooney M
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19263D728 List:
References
NUDOCS 7904130197
Download: ML19263D727 (2)


LER-1979-011, Forwards LER 79-011/01T-0
Event date:
Report date:
2781979011R00 - NRC Website

text

.

PHILAD ELPHI A ELECTRIC CO M PANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101 iz i si 041400o April 6,

1979 Mr. Boyce 31. Grier, Director Office of Inspection and Enforcement Region I United States Nuclear Regulatory Comnission 631 Park Avenue King of Prussia, Pe nn s yl va ni:1 19406

Dear :fr. Grier:

S U BJ i' CT :

1.icensee Event 'teport Narrative Description The following occurrence was reported to :f r.

E.

G.

Greenaan, Region 1,

Office of Inspection and Enforcement on !!a rc h 23, 1979.

Reference.

Docket Nunber 50-278 Report No:

LER 3-7t>-1t/IT Report Date:

April 6,

1979 Occurrence Date:

". a r c h 23, 1979 Facility:

Peach Hotton Atonic Power Station it. D.

t, Delta, PA 17314 Technical Specification Reference.

Technical Specification 3.7.A.2 states in part: " Primary containment integrity shall be maintained at a ll times when the reactor is critical or when the reactor temperature is above 212 degrees F....".

Also, Technical Specification 3.7.A.3 states "If the primary containment integrity is breached when it is required by 3. 7. /s. 2, that integrity shall be re es ta blished within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> or the reactor placed in a cold shutdown condition within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

Description of the Event During a routine inspection of the drywell torus ventilation valves, the inflatable disk seals vere found depressurized while the unit was in a startup mode.

The modification to correct a seismic design deficiency with these containment isolation valves h0?

V&

790413o /7 7 t

t J

dr.

Boyce d,.

G. rier Page 2 April 6,

1979 lea 79-11/IT was completed during the o u t a ;;e preceding this startup (Re: LER 2-79-ll/IT).

The inflatable disk seals were discovered approximately 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> beyond the allowuble Technical Specification limits provided in Sections 3.7.A.2 and 3.7.A.3.

Corrective action to establish containnent integrity was completed in approxiaately 40 minutes following discovey of this condition.

The reactor water was above 212 degrees F after 9 a.m.,

3/22/79 and criticality was established at 11:10 a.m.,

3/22/79.

The seal depressurization was discovered 12:30 p.m.,

3/23/79 and corrected by 1:10 p.m.,

3/23/79.

Conse_quences of Event Technical Specification 3.7.A.3 permits operation without primary containment integrity for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, therefore Tech. Spec.

3.7.A.2 and 3.7.A.3 were exceeded for approximately 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> due to procedural deficiency.

The safety s i c,n i f i c a n c e of this event is c ons id e ra bly reduced because reactor power du ring this period of time did not exceed a p p r o x i n.a t e l y 2%.

Cause of Event

The cause of this occu rrence was a procedural deficiency in that the i m p l e n.e n t i n g p rocedu res for this modification were not complet2d p rior to startup, thus the control room operator was unaware that manual operation was required to inflate the seals.

Corrective Action

Inflatable disk seals were pressurized within one hour after discove ry.

P roce du re s have been revised so that the containment isolation valve inflatable seals are included on the s ta rtup check-off list.

Yours truly,

/

g7((L Cooney 3.

St serintendent G neration Division-Nuclear Attachment cc Director, NRC - Office of Inspection and Enforcement Mr. Norman M. Haller, NRC - Office of M a na ;;e me n t &

Program Analysis