ML20207E769
| ML20207E769 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 07/18/1986 |
| From: | Devincentis J PUBLIC SERVICE CO. OF NEW HAMPSHIRE |
| To: | Noonan V Office of Nuclear Reactor Regulation |
| References | |
| RTR-REGGD-01.097, RTR-REGGD-1.097 SBN-1161, NUDOCS 8607220418 | |
| Download: ML20207E769 (5) | |
Text
SEABROOK STATION Enginstring Offica
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.d July 18, 1986 PutWe Service of New Hampshire SBN-1161 NEW HAMPSHIRE YANKEE DIVISION United States Nuclear Regulatory Commission Washington, DC 20555 Attention:
Mr. Vincent S. Noonan, Project Director PWR Project Directorate No. 5
References:
(a) Construction Permits CPPR-135 and CPPR-136, Docket Nos. 50-443 and 50-444 (b) PSNH Letter (SBN-1098), dated June 6,1986, " Accident Monitoring Instrumentation Review and Compliance with Regulatory Guide 1.97", J. DeVincentis to V. S. Noonan
Subject:
Accident Monitcring Instrumentation Review and Compliance with Regulatory Guide 1.97
Dear Sir:
In discussions with the NRC Staf f it was agreed that the Main Plant Vent Stack Noble Gas Radiation Monitor (FSAR Tabic 7.5-1, Item E7) provides the primary indication for detection of significant releases or breach of the containment.
The Containment Enclosure Noble Gas Radiation Monitor (FSAR Table 7.5-1, Item C-13) is backup indication that assists the operators in identifying the location of a release that has been identified by the Main Plant Vent Stack Monitor.
Since backup Type C variables are considered Design Category 3 we are revising the FSAR to reflect this change.
Attached are marked-up copies of FSAR Table 7.5-1, sheet 12 and page 7A-9 that reflects the change of the Containment Enclosure Noble Gas Radiation Monitor from Design Category 2 to 3.
These changes will be included in a future amendment to Seabrook's FSAR.
We trust that the enclosed is acceptable and request that this be reflected in the next supplement to Seabrook's SER.
Very truly yours, 8607220418 860718
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L PDR ADOCK 0500 3
f, John DeVincentis Director of Engineering Enclosure cc: Atomic Safety and Licensing Board Service List
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L Seabrook Station Construction Field Office. P.O. Box 700. Seabrook, NH O3874
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Dic20 Curren, Erquir3 Pater J. Mathswa, M:yor H:rmon & Weico City Hall 2001's. Street, N.W.
Newburyport, MA 01950 Suite 430 Washington, D.C.
20009 Judith H. Mizner Silvergate, Gertner, Baker, Sherwin E. Turk, Esq.
Fine, Good & Mizner Office of the Executive Legal Director 88 Broad Street U.S. Nuclear Regulatory Commission Boston, MA 02110 Tenth Floor Washington, DC 20555 Calvin A. Canney City Manager Robert A. Backus, Esquire City Hall 116 Lowell Street 126 Daniel Street P.O. Box 516 Portsmouth, NH 03801 Manchester, NH 03105 Stephen E. Merrill, Esquire Philip Ahrens, Esquire Attorney General Assistant Attorney General George Dana Bisbee, Esquire Department of The Attorney General Assistant Attorney General Statehouse Station #6 Office of the Attorney General l
Augusta, ME 0%333 25 Capitol Street Concord, NH 03301-6397 Mrs. Sandra Gavutis
]
Chairman, Board of Selectmen Mr. J. P. Nadeau i
RFD 1 - Box 1154 Selectmen's Office Kennsington, NH 03827 10 Central Road 4
Rye, NH 03870 Carol S. Sneider, Esquire Assistant Attorney General Mr. Angie Machiros Department of the Attorney General Chairman of the Board of Selectmen One Ashburton Place, 19th Floor Town of Newbury Boston, MA 02108 Newbury, MA 01950 Senator Gordon J. Humphrey Mr. William S. Lord U.S. Senate Board of Selectmen Washington, DC 20510 Town Hall - Friend Street l
(ATTN: Tom Burack)
Amesbury, MA 01913 Richard A. Hampe, Eng.
Senator Gordon J. Humphrey Hampe and McNicholas 1 Pillsbury Street 35 Pleasant Street Concord, NH 03301 Concord, NH 03301 (ATIN: Herb Boynton)
Thomas F. Powers III H. Joseph Flynn, Esquire Town Manager Office of General Counsel j
Town of Exeter Federal Emergency Management Agency 10 Front Street 500 C Street, SW I
Exeter, NH 03833 Washington, DC 20472 Brentwood Board of Selectmen Paul McEachern, Esquire RFD Dalton Road Matthew T. Brock, Esquire Brentwood, NH 03833 Shaines & McEachern 25 Maplewood Avenue i
Gary W. Holmes, Esq.
P.O. Box 360 i
Holmes & Ells Portsmouth, NH 03801 47 Winnacunnet Road Hampton, NH 03842 Robert Carrigg Town Office Mr. Ed Thomas Atlantic Avenue FEMA Region I North Hampton, NH 03862 442 John W. McCormack PO & Courthouse Boston, MA 02109
o' Administrative Judge Helen Hoyt, Chairperson Atomic Safety and Licensing Board Panel U.S. Nuclear Regulatory Commission Washington, D.C. 20555
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Administrative Judge Sheldon J. Wolfe, Chairman Atomic Safety and Licensing Board Panel U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Dr. Emmeth A. Luebke Atomic Safety and Licensing Board Panel U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Dr. Jerry Harbour Atomic Safety and Licensing Board Panel U.S. Nuclear Regulatory Commission Washington, D.C. 20555
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e TABLE 7.5-1 (Sheet 12 of 37)
Se 1796 DESIGN ENVIRONMENTAL SEISMIC NUMSEE VARIABLE CATECORY QUALIFICATION QUAL.
QA TSBSING R EMARKS/ NOTES C11 Contatament Pressure 1
Yes Yes Yes N/A C12 contalement Effluent See E7 Radioactivity - Noble Cases from identified Release Polete C13 Effluent Radioactivity
/T 3*
19/ N/A N/A Yes N/A e
See Deviation No. 9 in Appendia 7A.
Noble Cases (inside buildings or areas where penetrations or hatches are located)
TYPE D VARIA4LES. SYSTEM OPERATION RR
~
ta tal D1 RHu system Flow 2
Yes N/A Yes N/A ga e D2 RS Heat Eschanger 2
Yes N/A Yes N/A See Deviation No. 22 in Appendia 7A.
Outlet Temperature to SAFETY INJECTION D3 Accumulator Tank Level
- See Deviattom No. 10 in Appendia 7A.
D4 Accumulator Tank Pressuree a
See Deviation No.11 in Appendia 7A.
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4 SB1&2 Amendment 56 FSAR November 1985 SEABROOK STATION UNIT NO. 1 REGULATORY CUIDE 1.97, REVISION 3 REVIEW Deviation No. 9 Data Table Variable Item No.
Effluent Radioactivity - Noble cases C13 (Inside buildings or areas where penetrations or hatches are located.)
Deviation From Regulatory Guide 1.97 Guidance
~
The installed range, 10 to 10 CPM (corresponding to 6 x 10 to 10 uCi/cc), does not envelope the recommended range (10~ to 10 uci/cc).
This variable is classified as Design Category 3 instead of Design Category 2 as recommended in Regulatory Guide 1.97.
Justification The containment structure and all penetration / hatch areas are surrounded by the containment enclosure building. The exhaust from the containment enclosure building is monitored for Dross activity. The containment enclosure building exhaust is routed to the main plant vent stack, where it is monitored (10~ - 10 uci/ce) prior to discharge.
The Main Plant Vent Stack Monitor (Table 7.5-1, Item E7) monitors all releases to the atmosphere that may result from design basis accident events.
The Containment Enclosure Monitor is a backup to the Fbin Plant Vent Stack Monitor to assist the operators in identifying the source of the release.
Both the Main Plant Vent Stack Monitor and the Containment Enclosure Monitor provide indication of containment breach which is the purpose identified in Regulatory Guide 1.97.
Backup Type C variables are considered to be Design Category 3.
7A-9 SJ