ML19261F319
| ML19261F319 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/09/1977 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | |
| Shared Package | |
| ML19261F320 | List: |
| References | |
| GQL-1089, NUDOCS 7910250780 | |
| Download: ML19261F319 (4) | |
Text
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NRCFor'A 195 U.S. NUCLE AF REGULATOR' MISSION Qoc ET NUMBER aus M (2 76)
NRC DISTRIBUTION roR PART 50 DOCKET M ATERI AL B'CIDENT 7EPORT TO:
FROM:
cATE OF OCCUMENT Mr. Boyce H. Grier Metropolitan Edison Co.
8/9/77 Reading, PA 19603 OATE RECEtVED J.G. Herbein 8/15/77
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U NC LASSIFIE D CESCRIPTION EN CLOSU R E Licensee Event Report 450-289/77-21/lT on 7/26/77 concerning Radiation Monitor RM-A2 which was discovered to be out of
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service and con equently, a sample of the R.B. atmosphere was not performed.
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August 9, 1977 GQL 1089
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Mr. Ecyce H. Grier, Director Office of Inspection and Enfcrcement, Region I U.S. Iiuclear Regulatcry Cc==issicn
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631 Park Avenue King of Prussia, PA 19h06
Dear Sir:
Docket :lo. 5C-289 Operating License IIo. DPR-50 In accordance with the Technical Specifications of our Three Mile Island Nuclear Station, Unit 1 ('NI-1), we are reporting the folleving reportable occurrence.
1)
Report IIumber: 77-21/1T 2a) Required Report Date: 08/09/77 2b) Date of Occurrence: 07/26/77 3)
Facility: Three Mile Island IIuclear Station, Unit 1 h)
Identification of Cecurrence:
Title:
Reactor Building Atmosphere Sample Was iot Taken During an Eight Hour Period.
?/pe:
A reportable cccurrence as defined by paragraph 6.9.2.A.(2) in that Radiation Mcnitor RM-A2 was cut of service and a sc=ple of the Reactor Building atmosphere was not taken within eight (8) hours.
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Mr.'Boyce H. Crier August 9, 1977 GqL 1c89 5)
Conditions Prior to Occurrence:
Power:
Core 2532 bNt Elec.
826 MWe Gross RC Flow:
lhh x 106 lbs/hr RC Pressure:
2155 psi RC Te=p:
579 T ave PR7.R level:
220 inches PRL5 Temp:
6500F 6)
Description of Occurrence:
On July 26, 1977, Radiaticn Monitor RM-A2 was out-of-service and a representative sample of the Reactor Building atmosphere was not taken within eight (8) hours.
RM-A2 was cut-of-service because improper reassembly folleving surveillance testing on July 25, 1977, allowed in-leakage of air from the Intermediate Building. The leakage occurred because the Instrument Technician failed to reinstall the o-ring which seals the gas detector in the sample cha=ber.
A sample of the Beactor Building atmosphere was taken frc= RM-A2 approximately two (2) hours after discovery that the monitor appeared to be reading lov.
A subsequent grab sample, which shcVed an expected value of activity, of the actual Feactor Building atmosphere verified that the monitor was reading lov and the previous sample was invalid. A representative sample of the Reactor Building atmosphere was not obtained within eight (8) hours of the time that the menitor was last kncvn to be in service.
7)
Apparent Cause of Occurrence:
The cause of this occurrence has been determined to be due to both procedural inadequacies and personnel error in that:
1)
The Instrument Technician failed to ensure that the o-ring was in place prior to returning the detector to the sample chamber.
2)
The Surveillance Procedure, 1302-3.1, did not require that the Instrument Technician verify proper vacuu= and flow before returning the monitor to service.
8)
Analysis of Occurrence:
It has been determined that this event did not constitute a threat to the health and safety of the public in that:
a)
All other required Reactor Coolant Leak Detection Systems were in-service during thin incident.
b)
A sample of the Reactor Building atmosphere after the occurrence shoved s normal level of activity.
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', Mr. Boyce H. Grier August 9, 1977 GQL 1089 91 corrective Action:
IMMEDIATE:
Ir=.ediate corrective action included repair of the leaky moniter and a valid sa=pling of the Reactor Building atmosphere.
LONG TERM:
1)
The applicable Surveillance Procedure L.302-3.1) vill be revised to require a check for proper vacuum and flow prior to returning the monitor to service.
2)
The applicable Health Physics Procedure (1631) vill be revised to require that the Rad./ Chem. Technicians verify proper vacuum and flow prior to taking a sample.
3)
This event vill be discussed with the Instrument Technicians with emphasis on the need to exercise care in reassembly of equipment and to check for proper operation prior tc returning equipment to service.
- 10) Failure Data:
NA Similar Events:
76-6/1?
~ ncerely,
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J. G. Herbein Vice President JGH:DGM:kl Attachments 1482 042