05000280/LER-1980-062, Updated LER-80-062/03X-1:on 801019,w/Unit 1 Shutdown & defueled,RM-CC-105 & 106 Alarm Setpoints Found Contrary to Spec.Caused by Decreased Background Radiation Indications. Setpoints Reset to Value Less than Twice Background

Updated LER-80-062/03X-1:on 801019,w/Unit 1 Shutdown & defueled,RM-CC-105 & 106 Alarm Setpoints Found Contrary to Spec.Caused by Decreased Background Radiation Indications. Setpoints Reset to Value Less than Twice Background

ML18139B303
Person / Time
Site:	Surry
Issue date:	05/07/1981
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18139B300	List: 05000280/LER-1980-037-03, While Performing Periodic Test 26.1,radiation Monitor RM-SV-111 Found Inoperative. Caused by Spare Lug Short Causing Erroneous Indications. Lug Removed.Monitor Returned to Svc 05000280/LER-1980-062, Updated LER-80-062/03X-1:on 801019,w/Unit 1 Shutdown & defueled,RM-CC-105 & 106 Alarm Setpoints Found Contrary to Spec.Caused by Decreased Background Radiation Indications. Setpoints Reset to Value Less than Twice Background 05000280/LER-1981-007-03, W/Unit 1 Defueled & 2 at 100% Power,Power for Several Radiation Monitors Lost.Caused by Shorting of Test Lead to Ground Causing Supply Fuse to Blow.Fuse Replaced.Monitors Returned to Svc ML18139B299
References
LER-80-062-03X, LER-80-62-3X, NUDOCS 8105120495
Download: ML18139B303 (2)

LER-1980-062, Updated LER-80-062/03X-1:on 801019,w/Unit 1 Shutdown & defueled,RM-CC-105 & 106 Alarm Setpoints Found Contrary to Spec.Caused by Decreased Background Radiation Indications. Setpoints Reset to Value Less than Twice Background

Event date:
Report date:
2801980062R00 - NRC Website

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UPDAT~EPORT-PREVIOUS REPORT DATED 11~80 ATTACHMENT 1 SURRY POWER STATION, UNIT 1 DOCKET NO:

50-280 REPORT NO:

80-062/03X-1 EVENT DATE:

10-19--80 TITLE OF EVENT:

RM-CC-105/106 SETPOINTS OUT OF SPEC.

1.

DESCRIPTION OF EVENT

With. Unit 1 at cold shutdown and defueled, PT 26.1 showed RM-CC-105/106 alarm setpoints to be greater than twice background.

This,is contrary to Tech. Spec.

Table 3. 7-5 and is reportable as per T. S. 6. 6. 2. b. (4'f;*

2, PROBABLE CONSEQUENCES AND STATUS OF REDUNDA..~ SYSTEMS :

Component cooling ~ter radiation monitors (RM-CC-105/106) provide for the*

automatic closure of CC surge tank vent valve HCV-CC-100.

With the reduced background radiation resulting from Unit 1 defueling, the setpoint of RM-CC-105/106 must be lowered.

The setpoints being less conservative than those required by T.S. does not prevent the fulfillment of the functional requirements of this system.

Therefore the health and safety of the public were not affected.

3.

CAUSE

This-event was due,tb the*decrease in background radiation levels.

4.

IMMEDIATE CORRECTIVE ACTION

Reduce the alarm setpoints to less than twice background by use of procedure CAL-RM-004.

5.

SUBSEQUENT CORRECTIVE ACTION:

None required.

6.

ACTIONS TAKEN TO PREVENT RECURRENCE:

None.

7.

GENERIC IMPLICATIONS:

None.