05000346/LER-1978-003-03, /03L-0:on 780103,unidentified RCS Leakage Greater than 1,66 Gallon Per Minute.Caused by Loose Packing on Valve DH2735.Valve Repacked & Stroked

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/03L-0:on 780103,unidentified RCS Leakage Greater than 1,66 Gallon Per Minute.Caused by Loose Packing on Valve DH2735.Valve Repacked & Stroked
ML19326A204
Person / Time
Site: Davis Besse 
Issue date: 01/31/1978
From: David Brown
TOLEDO EDISON CO.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19326A199 List:
References
LER-78-003-03L, LER-78-3-3L, NUDOCS 8002030062
Download: ML19326A204 (2)
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LER-1978-003, /03L-0:on 780103,unidentified RCS Leakage Greater than 1,66 Gallon Per Minute.Caused by Loose Packing on Valve DH2735.Valve Repacked & Stroked
Event date:
Report date:
3461978003R03 - NRC Website
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[ ;,, ; 3 j lin tha Action Statement o t: T.S. 3.4.6.2 which requires unidentified leakuee to be less!

in:..j jthan i GP;i. At 2400 hours0.0278 days <br />0.667 hours <br />0.00397 weeks <br />9.132e-4 months <br /> on 1/3/73. the leak vas found to be a oncking leak on valrej (c_,. 3, t DU2735, renoving the unit from the Action Statement. At 1445 hours0.0167 days <br />0.401 hours <br />0.00239 weeks <br />5.498225e-4 months <br /> on 1/4/78, another!

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[h i ; [ a 9ressurizer level transmitter source valve packine leak.

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SUPP'_ ME::DL 1:7'ir:MATIO:: hoa LER :<P-33-79-05 I

DATE 0? E'.'E::T:

January 3 and 4, 1978 l

FACILITY: Davis-Bes se L' nit 1 IDESTI?ICATION OF CCCURRE::CE: Reactor Coolant System (RCS) unidentified laakage greater than 1 GPM.

t Cordition_s Prior to Occurrence: The unit was in Mode 1, with Power (: nit) = 2024

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and Load (:12) = 690.

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Descriotion of Occurrence: At 2030 hours0.0235 days <br />0.564 hours <br />0.00336 weeks <br />7.72415e-4 months <br /> on January 3,197S, unidentified RCS leakage was approximately 1.6 GP:1. This placed the unit in the Action Statement of Technical Specification 3.4.6.2 which requires unidentified leakage to be i

less than 1 GPM in Modes 1, 2, 3 and 4.

The unit was reduced to 40" power ac'2400 hours0.0278 days <br />0.667 hours <br />0.00397 weeks <br />9.132e-4 months <br /> on January 3,1978 and the unidentified leakage uns determined to be a pach-ing leak on DR.2735, the Pressurizer Auxiliary Spray Containment Isolation Valve.

The identificacian of the leakage removed the unit from the Action Statement of l

Technical Specification 3.i.6.2.

'N At 1445 hour: en Jcauary 4,1978, another unidentified leakage of 1.55 GFM was observed again, placin; the unit in the Action Statement of Technical Specifica-tion. 3.4.6.2.

Sy 2145 hours0.0248 days <br />0.596 hours <br />0.00355 weeks <br />8.161725e-4 months <br /> on January 4, 1978, the unit was reduced to 5.57.

power. At 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> on January 5.1978, the RCS leakage was identified as a pack-ing leak on Reactor Coolant Pressurizer Level Transmitter LI-RC-14-3 Sourec Valve l

removing the unit from the Action Statement of Technical Specifichtion 3.4.6.2.

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Dacinnation of Aonaren't Cause of Occurrence: The packing was too loose which allowed leakage out of the packing on DH 2735. The packing had been adjusted

.(loosened) por Maintenance teork order 77-2588 on December 3, 1977, for packing had previously been tightened to a point which caused valve to torque out when it was being operated. The packing gland was loose on LT-RC-14-3 Source Valve which allowed leakage out of the packing. The cause of the loose packing gland is unknown.

I Analysis of Occurrence: There was no danger to the health and safety of the l

public or to untt personnel. The small leakages vero confined to Containment

.and Containment integrity was maintained during the duration of the unidentifie!

Icakages.

t Corrective Ac: ion: ' valve D112735 was repached and stroked by 0435 hours0.00503 days <br />0.121 hours <br />7.19246e-4 weeks <br />1.655175e-4 months <br /> on January 4, 1975 par Maintenance i.'ork order 77-2597.

The Source Valve on LT-RC-14-3 was ropa kcd on January 11. 1978 per Maintenance teork Order 78-106.

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