ML20246P663
| ML20246P663 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 05/15/1989 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Mroczka E NORTHEAST NUCLEAR ENERGY CO. |
| Shared Package | |
| ML20246P670 | List: |
| References | |
| TAC-72951, NUDOCS 8905220256 | |
| Download: ML20246P663 (4) | |
Text
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- NUCLEAR REGULATORY COMMISSION iE WASHINGTON, D. C. 20555 May 15,1989
. Docket No. 50-245 Mr.. Edward J. Mroczka
-Senior Vice President Nuclear Engineering and Operations Northeast Nuclear Energy Company P. O. Box 270 Hartford, Connecticut 06141-0270
Dear Mr. Mroczka:
?
SUBJECT:
REVOCATIONOFEXEMPTIONFROM10CFR50.49FORCERTdINVAL'VE" OPERATORS - MILLSTONE NUCLEAR POWER STATION, UNIT NO. 1
By letter dated June 8. 1987,-the NRC granted, pursuant to 10 CFR 50.12, an exemption from the environmental qualification requirements of 10 CFR 50.49 for seven valve motor operators. At that time, it was determined that the.
-additional qualification of these valve motor operators was not necessary to_
ensure that the required systems will function to mitigate a design basis event.
Two of 1!he valves; covered by that exemption,1-C0-2 and 1-0U-3, are isolation
' valves on the reactor water cleanup. system suction piping. NNECO had assessed the 1ikelihood that these valves would perform their intended function prior-to harsh post-accident environments and determined that qualification was not necessary given the availability and timing of isolation signals.. On
. January 31 s1969, the licensee determined that the isolation signals may not
' produce a timely isolation response for a limited number of small pipe break scenarios.- For these scenarios, the resulting environment, although less severe lthan under a large break, would be present over a longer period of time than for large breaks prior to detection of the break and initiation of the.
isolation signals. Thus, the operability of these' valve motor operators _under these conditions could not be assured.
By letter dated March 2,.1989, NNEC0 forwarded Licensee Event Report (LER)89-001 to document this issue.
In that LER NNECO identified appropriate short term corrective actions and committed to replace the valve operators for 1-CU-2 and 1-CU-3 with environmentally qualified operators during the next refueling outage which has since started on April 8, 1989. By letter dated April 17, 1989, NNECO furnished additieral information on.this issue.
Based on the information presented by NNECO and NNECO's commitment to qualify the motor operators for valves 1-CU-2 and 1-CU-3 during the current refueling outage, the NRC is revoking the exemption from 10 CFR 50.49 for these two l.
valves.
In addition, NNECO is required to complete the qualification of these l
valves prior to restart of Millstone Unit 1.
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-PDR-ADOCK 05000245 P.
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- Mr. ' Edward J. firoczka It should be noted that five valve operetors are still covered by the June 8, 1987, exemption.
The motor operators for valves 1-LP-15A/B and 1-LP-16A/B (containment spray isolation valves) are being replaced by NNECO with operators that meet the requirements of 10 CFR 50.49 because the containment spray func-tion will be included in NNECO's upgrade of the Millstone Unit No.1 Emergency Operating Procedures (EOPs) to Revision 4 The need for the continuance of the exemption for these valves will be reviewed prior to the E0Ps being implemented in the Fall of 1989.
Sincerely,
/s/
Steven A. Varga, Director Division of Reactor Projects I/II Office of Nuclear Reactor Regulation
Enclosure:
Revocation of Exemption cc w/ enclosure:
See next page DISTRIBUTION caDocket File '
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Mr. Edward J. Mroczka,
It should be noted that five valve operators are still covered by the June 8, 1987, exemption. The motor operators for valves 1-LP-15A/B and 1-LP-16A/B 1
(containment spray isolation valves) are being replaced by NNECO with operators that meet the requirements of 10 CFR 50.49 because the containment spray func-i tion will be included in NNECO's upgrade of the Millstone L' nit No.1 Emergency Operating Procedures (EOPs) to Revision 4.
The need for the continuance of the exemption for these valves will be reviewed prior to the E0Ps being implemented in tha Fall of 1989.
Si
- rely, Oh even A.
arga, D r
'or Division of Reactor dectsI/II Office of Nuclear Reac r Regulation
Enclosure:
Revocation of Exemption cc w/ enclosure:
See next page
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?Mr.. Edward J. Mroczka Millstone Nuclear Power Station Northeast Nuclear Energy Company Unit No. I cc:
1 Gerald Garfield, Esquire R. M. Kacich, Manager Day, Berry and Howard Generation Facilities Licensing Counselors at Law Northeast Utilities Service Company l
City Place Post Office Box 270 l
Hartford, Connecticut 06103-3499
. Hartford, Connecticut 06141-0270 j
W. D. Rpberg, Vice President D. O. Nordquist Nuclear Operations Manager sf Quality Assurance Northeast Utilities Service Company Fsrtheast Nuclear Energy Company Post Office Box 270 Post Office Box 270 Hartford, Connecticut 06141-0270 Hartford, Connecticut 06141-0270 Kevin McCarthy, Director Regional Administrator Radiation Control Unit Region I Department of Environmental Protection U. S. Nuclear Regulatory Commission State Office Building' 475 Allendale Road q
3 Hartford, Connecticut 06106 King of Prussia, Pennsylvania 19406 l
i Bradford S. Chase, Under Secretary First Selectmen Energy Division Town of Waterford Office of Policy and Management Hall of Records
.80 Washington Street 200 Boston Post Road Hartford, Connecticut 06106 Waterford, Connecticut 06385 S. E. Scace, Station Superintendent W. J. Raymond, Resident Inspector Millstone Nuclear Power Station Millstone Nuclear Power Station Northeast Nuclear Energy Company c/o D. S. Nuclear Regulatory Comission Post Office Box 128 Post Office Box 811 Waterford, Connecticut 06385 Niantic, Connecticut 06357 J. P. Stetz, Unit Superintendent Millstone Unit No. I Northeast Nuclear Energy Company Post Office Box 128 Waterford, Connecticut 06385 1
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