ML20235S410
| ML20235S410 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 09/29/1987 |
| From: | Thomas C Office of Nuclear Reactor Regulation |
| To: | Mroczka E NORTHEAST NUCLEAR ENERGY CO. |
| Shared Package | |
| ML20235S413 | List: |
| References | |
| TAC-64193, NUDOCS 8710080488 | |
| Download: ML20235S410 (4) | |
Text
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UNITED STATES 8
NUCLEAR REGULATORY COMMISSION o
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September 29, 1987 Docket No.:
50-245 Mr. Edward J. Mroczka, Senior Vice President Nuclear Engineering and Operations Northeast Nuclear Engineering Company Post Office Box 270 Hartford, Connecticut 06141-0270
Dear Mr. Mroczka:
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SUBJECT:
RADIATION MONITORS - MAIN STEAM LINE AND TUNNEL VENTILATION SET POINT CHANGES (TAC 64193)
Re: Millstone Nuclear Power Station, Unit No. 1 The Commission has issued the enclosed Amendment No. 12 to Facility Operating License No. DPR-21 for the Millstone Nuclear Power Station, l
Unit No. 1.
This amendment is in response to your application dated December 16, 1986 and supplement dated January 30, 1987.
This amendment modifies Technical Specification (TS) 3.2.E.3.c, TS Basis 3.2, and Tables 3.1.1 and 3.2.1.
The TS changes involve higher set points for the main steam line radiation monitors (MSLRMs) and the by licensee plans for a Hydrogen Water Chemistry (HWC)ges were prompted steam tunnel ventilation radiation monitors. The chan Pre-Implementation Test. The purpose of the test is to study the feasibility of hydrogen addition to the primary coolant to inhibit intergranular stress corrosion cracking (IGSCC) at Millstone Unit No. 1.
The addition of hydrogen is expected to reduce the concentration of oxygen in the primary coolant but coincidentally increase the nitrogen-16 (N-16) activity in the steam.
Increased N-16 activity results in a higher background radiation level at the MSLRMs and the steam tunnel ventilation radiation monitors. NNEC0 notes that similar HWC tests have been conducted at several nuclear power plants, including Dresden 2, Peach Bottom 3, Pilgrim, Fitzpatrick, and Duane Arnold.
Similar changes to the MSLRM set points have been reviewed and approved by the NRC staff. NNEC0 plans to conduct this test near the start of Cycle 12 (Fall 1987).
The change to TS 3.2.E.3.c increases the trip set points for the steam tunnel ventilation radiation monitors (that cause steam tunnel ventilation isolation and initiation of the Standby Gas Treatment System) from 12 mr/hr to 50 mr/hr with special provisions, via footnote number 12, for set point adjustments to 100 mr/hr during the HWC test.
The change to TS Basis 3.2 relates to the TS change from 12 mr/hr to 50 mr/hr described above, m iBMRBE b P
w }.
Edward J. Mroczka 'The change to Table 3.1.1 adds a new footnote (footnote 12) to provide for increased; trip set points for the MSLRMs (the MSLRMs cause reactor scram in addition to primary coolant system and containment isolation if radiation levels in the steam line increase to the trip set point) during the HWC tests.
The change to Table 3.2.1 adds a new footnote (footnote 6) for consistency with the change above to Table 3.1.1.
Also included with this amendment are corrected pages, 3/4 12-7 and 3/4 12-8, to replace the same numbered pages that were changed by Amendment No. 2.
The change to TS 3.12.C.4 included with this amendment was inadvertently omitted with Amendment No. 2 issued February 20, 1987. The TS 4.12.C.2 change concerns the word " System"; it should read " Systems."
A copy of our related Safety Evaluation is enclosed. A Notice of Issuance will appear in the Commission's next regular biweekly Federal Register notice.
Sincerely, G126? d w r Cecil 0. Thomas, Director Integrated Safety Assessment Project Directorate Division of Reactor Projects - III, IV, V j
and Special Projects
Enclosures:
1.
Amendment No.12 to License No. DPR-21 2.
Safety Evaluation cc w/ enclosures:
See next page
______________o
y
.. g,i Edward'J. Mroczka-2-
'The changeLto Table 3.1.1 adds a'new footnote (footnote 12) to provide for increased' trip setpoints for the MSLRMs (the'MSLRMs cause reactor' scram in
- addition to primary coolant system'and containment isolation if radiation levels in the steam line increase to the trip setpoint) during the.HWC tests.
The change. to Table 3.2.1 adds a~ new footnote'(footnote 6) for consistency with the change above to Table 3.1.1.
Also_ included with~this amendment are corrected pages, 3/4 12-7 and 3/4 12-8, f to! replace the same numbered pages that were changed by Amendment No. 2.
The change.to TS 3.12.C.4 included with this anendment was inadvertently omitted -
with Amendment No. 2 issued February 20, 1987. The TS 4.12.C.2 change concerns the' word " System"; it should read " Systems."
A copy of our related Safety Evaluation is enclosed. A Notice of Issuance
' will appear in the Commission's next regular biweekly Federal Register notice.
Sincerely, Cecil 0. Thomas, Director Integrated Safety Assessment Project Directorate Division of Reactor Projects - III, IV, V and Special Projects Enclosuros:
DISTRIBUTION 1.
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Mr. ' Edward J. Mroczka Millstone Nuclear Power Station
' Northeast Nuclear Energy Company Unit No. I cc:
Gerald Garfield, Esquire Kevin McCarthy, Director Day, Berry & Howard Radiation Control Unit
' Counselors at Law Department of Environmental City Place Protection Hartford, Connecticut. 06103-3499 State Office Building Hartford, Connecticut.06106 Wayne D. Romberg-Vice President, Nuclear Operations Richard M. Kacich, Manager.
. Northeast Utilities Service Company Generation Facilities Licensing
' Post Office Box 270 Northeast Utilities Service' Company Hartford, Connecticut 06141-0270 Post Office Box 270 Hartford, Connecticut 06141-0270 Bradford S. Chase, Under Secretary Energy Division Office of Policy and Management J. Stet 7, Plant Superintendent 80 Washington Street Millstone, Unit 1 Hartford Connecticut 06160' Northeast Nuclear Energy Company P.O. Box 128 Waterford, Connecticut 06385 Regional Administrator, Region !
Donald 0. Nordquist, Director U.S. Nuclear Regulatory Commission Quality Services Department 631 Park Avenue Northeast Utilities Service Company Kino of Prussia, Pennsylvania 19406 Post Office Box 270 Hartford, Connecticut 06141-0270 Northeast Nuclear Energy Company ATTN:
Superintendent Millstone Nuclear Power Station P. O. Box 128 Waterford, Connecticut 06385 Resident Inspector c/o U.S. NRC Millstone Nuclear Power Station P. O. Box 811.
Niantic, Connecticut 06357 First Selectman of the Town of Waterford i
Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 1
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