ML19305D778
| ML19305D778 | |
| Person / Time | |
|---|---|
| Site: | FitzPatrick  |
| Issue date: | 04/09/1980 |
| From: | Early P POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK |
| To: | Ippolito T Office of Nuclear Reactor Regulation |
| References | |
| JPN-80-22, NUDOCS 8004150508 | |
| Download: ML19305D778 (2) | |
Text
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POWER AUTHORITY OF THE STATE OF NEW YORK 10 COLUMaus CIRCLE NEW YORK N. Y. too19 (212) 397 8200 G EO R,c,E 7. S ER RY oranarine oprican TRUSTEES JOHN W. SOSTON JOHN 3.DYSON Nio'au Nasevon or Powan orsn4rloNS G EORGE L. LNG ALLS JOSEPH A SC IEDER vics enannuan Pas OsNT&CnisP RICH ARD M. FLYNN April 9,1980 LEROY W. SINCLAIR ROSERT 1. MILLONn JPN-80-22 "c[s"fiOile""' '"'
rREoERiCx R. CLARx THOM AS R. FREY Director of Nuclear Reactor Regulation
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U.
S. Nuclear Regulatory Commission Washington, D. C.
20555 Attention:
Mr. Thomas A.
Ippolito, Chief Operating Reactors Branch No. 3 Division of Operating Reactors
Subject:
James A. FitzPatrick Nuclear Power Plant Docket No. 50-333 Control Rod Drive Failure Experience
Reference:
Letter, Thomas A.
Ippolito, (NRC) to George T.
- Berry, (PASNY) dated January 10, 1980
Dear Sir:
In response to the NRC request for the more recent control rod failures, the Authority has compiled the following which summarizes the scrams at James A. FitzPatrick from September 9, 1978 through December 31, 1979.
DATE DEFICIENT RODS INITIAL POSITION FINAL POSITION December 7, 1978 None Apparent December 17, 1978 None Apparent December 24, 1978 18-15 48 02 March 15, 1979 None Apparent September 9, 1979 18-15 48 02 October 27, 1979 26-27 48 02 December 27, 1979 18-15 48 02 December 31, 1979 26-27 48 02 P
On October 27, 1979, during single-rod scram time testing, rod 26-27 was noted to have a longer than normal scram insertion time.
It also bounced back from "00" to "02" after the test.
On December 27, 1979, during a reactor scram, rod 18-15 reportedly returned to position "02" after scramming.
On December 31, 1979, during single-rod scram time testing, rod 26-27 returned to "02" from "00" after the scram test switch was reset.
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! In addition to the above events, there were numerous occasions where drive pressures in excess of 350 psig were required to with-
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draw a rod from position 00.
On November 13, 1978, drive 46-27 was inoperable and electrically disarmed to repair a packing leak while the plant was shutdown and all rods were inserted.
There were two indications of uncoupled control rods:
l'.
On August 19, 1979, drive 22-07 gave an overtravel alarm.
The drive was fully inserted and electrically disarmed.
The drive and position indication probe were replaced on August 30, 1979.
Inspection showed no damage that would explain the alarm.
2.
On November 11, 1979, drive 46-11 gave an overtravel alarm.
Subsequent coupling / overtravel tests could not reproduce the overtravel alarm.
It is under con' sideration by the FitzPatrick staff to overhaul the control rod drives mentioned in this letter during the up-coming outage.
Very truly yours, h
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Paul J. Early d
Assistant Chief Engineer-Projects I