05000280/LER-1980-033-03, /03L-0:on 801024,w/unit at 100% Power,Positive Pressure of Greater That 0.05 Inches of Water Could Not Be Maintained in Control Room.Caused by Deterioration of Door Seals.Defective Doors Repaired

/03L-0:on 801024,w/unit at 100% Power,Positive Pressure of Greater That 0.05 Inches of Water Could Not Be Maintained in Control Room.Caused by Deterioration of Door Seals.Defective Doors Repaired

ML18139A845
Person / Time
Site:	Surry
Issue date:	11/17/1980
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139A844	List: 05000280/LER-1980-032-03, /03L-0:on 801020,during Check of Low Heat Tracing Alarms,Circuit 2A Panel 11 Found to Have Low Amps.Caused by Damage to Heat Tracing Tape.Operation of Redundant Heat Tracing Circuit Verified & Tape Replaced 05000280/LER-1980-033-03, /03L-0:on 801024,w/unit at 100% Power,Positive Pressure of Greater That 0.05 Inches of Water Could Not Be Maintained in Control Room.Caused by Deterioration of Door Seals.Defective Doors Repaired 05000280/LER-1980-062-03, /03L-0:on 801019,w/unit at Cold Shutdown & Defueled,Pt 26.1 Showed RM-CC-105/106 Alarm Setpoint to Be Greater than Twice Background Radiation Levels.Caused by Decrease in Background Radiation Levels.Setpoints Reduced ML18139A843
References
LER-80-033-03L-02, LER-80-33-3L-2, NUDOCS 8011210522
Download: ML18139A845 (2)

LER-1980-033, /03L-0:on 801024,w/unit at 100% Power,Positive Pressure of Greater That 0.05 Inches of Water Could Not Be Maintained in Control Room.Caused by Deterioration of Door Seals.Defective Doors Repaired

Event date:
Report date:
2801980033R03 - NRC Website

text

• e LICENSEE EVENT REPORT u9uci..EAR REGULATORY COMMISSION- *

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IT)) I On October 24,1980, with the Unit at* 100% JXJW&, a positive pressure. of greater than O. 05 i.mhes of water, could not be maintaine:l in the control roan.

This contrary to [IT) I T.S. 3.19.A and is re~rtable per T.S. 6.6.2.b. (2).

The anergency rontmJ_ mom ventilation systan was operable therefore the heal th and safety of the p.lblic were not affecte:l.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 43 44 47 ill] I The doors to the control rogn complex wula 'not cJ ase p:roperl ¥ QT. their seals were ITTI I deteriorate:l.

The defective doors :were repairecL DIJ.L_ _______________________________________ __.

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ATl'ACHMEN'l' 1 SURRY IDWER S'm.TION,UNIT 2 IXXl<ET NO:

50-281 REPORI' NO:

80-033/03~0 EVENT DATE: 10-24-80 SUBJOCT:

EXCESSIVE CDNTROL IOJM LEA.-r<AGE

1.

DESCRIPI'ICN of EVENT On October 24, 1980, with Unit No~ 2 at 100% p.:>wer, 'MOP-21. 3 was perfonnerl to verify the operability of the Control Room emergency ventilation system prior td breaching the control :roc:::rn pressure boundary (installation of a new fire damper) *. The.. emergency ventilation was proven operable, however a p.:>sitive pressure, of greater than O. 05 inches of water, could not be maintain.Erl in the control rcx::m.

This is contra:ry to Technical Specification 3.19.A and is re-p.:>rtable per Technical Specification 6.6.2.b.(2).

2.

PIDBABLE CONSEQJENCES and S'm'IUS of REDUNDANT EgJIPM:8NT

.. The requirement of 0.05 inches of water ensures t.1-iat the integrity of the

.. control room is such that.the 1:ottlerl air* system* will prevent the inleakage

, ** of radioactive material for a period of one h:>rn; d,uring a I..OCA.

The emergency ventilation system was o~le and a need for~ttled. a~. g.,icl. ~t-~~*-*

Therefore the health and safety of the pililic were not affecterl.

3.

CAUSE

The doors fran t.'1-ie emergency Switchgear Roan to the 'furbine building w:iuld not close properly and the seals on the doors to the Instrument Shop, TUrbine building (26'6") #3 machinery room and cable tunnels had deterioraterl due to,;usage.

4., IMMEDIATE CORRECTIVE ACTION Verified the emergency ventilation system to be functional.

Initiaterl an investigation to detenn:ine the source of leakage.

5.

SUBSEgJENT CORRECTIVE ACTION Defective doors were identifierl and repaired.

6.

ACTION 'mKEN to PRE.VENT RIDJRRANCE Frequent perfonnance of the MJP and the develoi;:nent of check list for door seals *will identify developing problems.

7 *. *GENERic**IMl?LICATIONS

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