ML19350C568
| ML19350C568 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/11/1981 |
| From: | Hukill H METROPOLITAN EDISON CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-79-24, TLL-695, NUDOCS 8104060043 | |
| Download: ML19350C568 (2) | |
Text
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fh Metropolitan Edison Company Post Office Box 480 Middletown, Pennsylvania 17057 Writer's Direct Dial Number 3
March 11,1981 TLL 695
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, g p %*y @N
((Y Office of Inspecti... mut Enforcement Attn:
B. H. Grier, Director 6
Region I
!' / '7 U. S. Nuclear Regulatory Commission E
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Tg 631 Park Avenue y,,,
g King of Prussia, PA 19406 i 4 h
Dear Sir:
Three Mile Island Nuclear Station, Unit 1 (TMI-N Operating License No. DPR-50 Docket No. 50-289 IE Bulletin 79-24 Frozen Lines This letter is the final response concerning the subject bulletin as referenced in our letter of November 6, 1979 (GQL 1391) which stated that the NRC would be infomed of any major deficiencies found during the heat trace inspection.
The deficicticles found did not jeopardize the safe operation or safe shutdown of the plant and redundancy was available for safety-related systems. A detailed listing of the deficiencies found and their effects is provided in the attached table.
Maintenance to correct these items was initiated on December 6, 1979, and all repairs were completed by March 30, 1980.
Additionally, a preventive main:enance program is under development to ensure continued operation of the heat tracing.
This program is scheduled for implementation by September l
1981.
Sincerely, Gll w%U H. D.
tkill Director, TMI-l HDH:DGM:1ma Attachment cc:
B. J. Snyder R. W. Reid D. Dilanni' H. Silver-L. Barrett 8104060 N Metropolitan Ed: son Company is a Member of the General Pubhc Util.t.es System
Attac1 ment TABLE i
TLL 695 C
IDENTIFIED llEAT TRACE DEFICIENCIES ITEM DEFICIENCY REMARKS lent trace (a) from BS-P2 to BS-T1 lleat trace disconnected at control panel 4A.
If discharge line freezes, no sample samp10 recirc discharge line).
recirc.
This will not inhibit RB Spray system operation.
Line can be thawed before sampling.
leat trace (b) from BS-P2 to BS-T1 lleat trace disconnected at control panel 4P.
See comments above sample recirc discharge line).
leat trace (a) from BS-P2 to BS-T2.
No current, Open heat trace.
Protected by heat trace (b).
leat trace (a), BS-P2 discharge nozzle.
No current, open heat ', race.
Protected by heat trace (b).
leat trace (a) from BS-T2 to BS-P2.
lleat trace disconnected at control panel 4A.
If pump suction line from BS-T2 freezes,a sample recirc.
This will not inhibit RB Spray system operation.
Line can be thaw:
before sampling.
Icat trace (b) from BS-T2 to BS-P2 lleat trace disconnected at control panel 4B. See conunent above.
leat trace (b) from BS-Tl to BS-P2.
Broken capillary tubing on thermostat.
Protected by heat trace (a).
leat trace (a) on BS-Tl local sample line. Broken thermostat Draw local samples from instrument sensia line bleed valve on BS3-LT.
' eat trace (b) on BS-Tl local sample line. Thermostat inoperable See above connient.
ieat trace (a) on BS3-LT (high side) lleat trace disconnected at control panel 4A Protected by heat trace (b).
l sensing line.
' eat trace (a) on BS3-LT (low side) lleat trace disconnected at control panel 4A Protected by heat trace (b).
sensing line.
Dat trace (a) on BWST overflow / vent line. Thermostat burned up Protected by heat trace (b).
[WST line to Dil-V53(14")
Lagging in poor condition lleat traces (a & b) operable.
{0TE1: All heat traces are redundant with an (a) and a (b) trace from different control panels.
h0TE2: lleat traces listed as disconnected at the control panel had been purposely removed for maintenance on the heat trace or associated piping during the extended cold shutdown of the Unit.
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