ML20147D734
| ML20147D734 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 02/12/1997 |
| From: | Andersen J NRC (Affiliation Not Assigned) |
| To: | Kenyon B NORTHEAST UTILITIES SERVICE CO. |
| References | |
| NUDOCS 9702140192 | |
| Download: ML20147D734 (6) | |
Text
_.
Mr. B. D. K:ny ri
- +<
Feb arf 12,1997 Presid:nt - Nuclear Gr:up
. North:ast Utilities S:rvice Company c/o Mr. Richard T. Laudenat Director - Nuclear Licensing Services P.O. Box 128 Waterford, CT 06385.
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING A SEPTEMBER 26, 1996, EVENT NOTIFICATION AND LICENSEE EVENT REPORT (LER) 96-036-00
Dear Mr. Kenyon:
On September 26, 1996, Northeast Nuclear Energy Company (NNECO) informed the NRC, pursuant to 10 CFR 50.72(b)(2)(iii)(D), that they had identified 21 safety-related air operated valves that are controlled by solenoid operated pilot valves, which do not receive Class _1E power. NNECO followed up the t
event notification with License Event Report 96-036-00, dated October 25, 1996.
The NRC staff has completed a preliminary review of this event and has identified several issues that require additional information.
Please respond to the enclosed request for additional information within 60 days from receipt i
of this letter. -
Sincerely,
/S/
James W. Andersen, Project Manager Special Projects Office - Licensing Office of_ Nuclear Reactor Regulation I
Docket No. 50-423
Enclosure:
As stated cc w/ encl:
See next page DISTRIBUTION:
Docket File PUBLIC SP0 P1 ant WTravers PMcKee f
LBerry
/
i JAndersen S
OGC 1
,/
v[/7//
JDurr, RI 4
..,.e mi. m.n.\\.ANDERS EN(A0V-S0V. RAIwe. w m. wc c. co.y wrhout.it.cMi..
co,y with.it. chm.nt/enclosur.
DOCUMENT NAME:
G:
'N' = No copy r2 L
SPh/lfDD -
l l
l 0FFICE SPO-L:PM
/l SPO-L:LA
' i NAME JAndersenA,.
LBer*y' d'd/
Pt4d(eb DATE 02/i,/97 02/V/97 b
Ot/(L/97 0FFICIAL RECORD COPY 140026 30 FILE CENTER COP 9702140192 970212 PDR ADOCK 05000423 h
S PDR
nro g
UNITED STATES NUCLEAR REGULATORY COMMISSION
~
f WASHINGTON, D.C. 2006H001 f
February 12, 1997 o
Mr. B. D. Kenyon President - Nuclear Group Northeast Utilities Service Company c/o Mr. Richard T. Laudenat Director - Nuclear Licensing Services P.O. Box 128 l
Waterford, CT 06385
SUBJECT:
REQUEST FOR ADDITIONAL INFORMATION REGARDING A SEPTEMBER 26, 1996, EVENT NOTIFICATION AND LICENSEE EVENT REPORT (LER) 96-036-00
Dear Mr. Kenyon:
On September 26, 1996, Northeast Nuclear Energy Company (NNECO) informed the NRC, pursuant to 10 CFR 50.72(b)(2)(iii)(D), that they had identified 21 safety-related air operated valves that are controlled by solenoid operated pilot valves, which do not receive Class IE power. NNECO followed up the event notification with License Event Report 96-036-00, dated October 25, 1996.
The NRC staff has completed a preliminary review of this event and has identified several issues that require additional information.
Please respond to the enclosed request for additional information within 60 days from receipt of this letter.
Sincerely, ines W. Andersen, Project Manager
. Special Projects Office - Licensing Office of Nuclear -Reactor Regulation Docket No. 50-423
Enclosure:
As stated cc w/ encl:
See next page
i j
RE00EST FOR ADDITIONAL INFORMATION i
i MILLSTONE LMIT 3 D0CKET NO. 50-423 On September 26, 1996, Northeast Nuclear Energy Company (NNECO) informed the NRC, pursuant to 10 CFR 50.72(b)(2)(iii)(D), that tiey had identified 21 safety-related air operated valves (A0Vs) that are controlled by solenoid operated pilot valves (SOVs), which do not receive Class IE power. The 21 i
SOV/A0V control switches, whose failure could affect safety system capability, l
were not included in the Millstone Unit 3 quality assurance program (i.e.,
1 they were not-Q-listed). The initial design (and subsequent modifications to the design) of the 50V/A0V control switch circuits (including administrative control) may not have been subject to appropriate design control measures.
l Thus, the initial and/or the current design for the non-Q-listed SOV/A0V control switch circuits may not meet Millstone Unit 3 licensing basis i
requirements.
In order to establish safety significance, the licensing basis i
requirements and extent of current compliance must be established for the subject SOV/A0V control switch circuit design. Thus, the staff requests a licensee-response to the following questions:
1.
With respect to omtrol switch circuits associated with the safety j
related SOVs/A0Vs located in redundant safety systems, which were identified in the September 26, 1996, event notification as not i
receiving Class IE power and not Q-listed, the licensing basis for Millstone Unit 3 (position C.3 of Regulatory Guide 1.53) requires single j
switches supplying signals to redundant safety equipment to be designed with at least 6-inch separations or with suitable barriers between redundant circuits. For those control switch circuits associated with
]
redundant safety systems, describe to what extent these circuits j
(current as-installed design configurations) meet this 6-inch or barrier j
licensing basis requirement.
i 2.
For control switch circuits associated with the safety-related 50Vs/A0Vs incated in single non-redundant safety systems, which were identified in i
the September 26, 1996, event notification as not receiving Class IE j
power and not Q-listed, describe the design provisions (i.e., the Millstone licensing basis) that ensures that no single failure in the control circuit to the single or non-redundant safety systems (including the circuits power supply) can cause loss of safety system function.
Describe to what extent these circuits (current as-installed design i
i configuration) meet this (to be described) Millstone licensing basis.
l l
3.
With respect to the power supply for control switch circuits associated with the safety-related SOVs/A0Vs located in redundant safety cystems, i
which were identified in the September 26, 1996, event notification as 1
not receiving Class IE power and not Q-listed, it appears, based on information available, that the licensing basis for Millstone Unit 3 i
requires an open control switch and administrative controls for assuring j
the switch is maintained in the open position. Confirm that an open a
Enclosure i
control switch and administrative control are the licensing basis requirements for Millstone. Or, describe the licensing basis for assuring that a single failure of common power supplies to redundant safety systems will not cause loss of safety function.
In addition, describe to what extent switches have been maintained in their open position. Or, if applicable, describe to what extent the power supply, as an installed design configuration, meets the licensing basis (to be described if applicable) for assuring single failure of common power supplies to redundant safety systems will not cause loss of safety function.
i s
j
Northeast Utilities Service Company Millstone Nuclear Power Station Unit 3 cc:
Lillian M. Cuoco, Esquire Senior Nuclear Counsel Northeast Utilities Service Company Mr. William D. Meinert P.O. Box 270 Nuclear Engineer Hartford, CT 06141-0270 Massachusetts Municipal Wholesale Electric Company Mr. Kevin T. A. McCarthy, Director P.O. Box 426 Monitoring and Radiation Division Ludlow, MA 01056 Department of Environmental Protection 79 Elm Street Joseph R. Egan, Esquire Hartford, CT 06106-5127 Egan & Associates, P.C.
2300 N Street, NW Regional Administrator, Region I Washington, D.C. 20037 U.S. Nuclear Regulatory Commission 475 Allendale Road Mr. F. C. Rothen King of Prussia, PA 19406 Vice President - Work Services Northeast Utilities Service Company First Selectmen P.O. Box 128 Town of Waterford Waterford, CT 06385 Hall of Records i
200 Boston Post Road Ernest C. Hadley, Esquire i
Waterford, CT 06385 1040 B Main Street i
P.O. Box 549 i
Mr. Wayne D. Lanning West Wareham, MA 02576 Deputy Director of Inspections
]
Special Projects Office Mr. John Buckingham 475 Allendale Road Department of Public Utility Control l
King of Prussia, PA 19406-1415 Electric Unit 10 Liberty Square M. H. Brothers, Nuclear Unit Director New Britain, CT 06051 Millstone Unit No. 3 Northeast Nuclear Energy Company Mr. James S. Robinson P.O. Box 128 Manager, Nucler Investments and Waterford, CT 06385 Administration New England Power Company Burlington Electric Department 25 Research Drive c/o Robert E. Fletcher, Esq.
Westborough, MA 01582 271 South Union Street Burlington, VT 05402 Mr. T. C. Feigenbaum Executive Vice President Mr. M. R. Scully, Executive Director and Chief Nuclear Officer Connecticut Municipal Electric Northeast Utilities Service Company Energy Cooperative.
P.O. Box 128 30 Stott Avenue Waterford, CT 06385 Norwich, CT 06360
-. - - -.. ~ _
b
+ o Northeast Utilities Service Company Millstone Nuclear Power Station i
Unit 3 cc:
Mr. D. M. Goebel Vice President - Nuclear Oversight Northeast Utilities Service Company P.O. Box 128 Waterford, CT 06385 Mr. J. P. Cowan Millstone Unit No. 3 Nuclear Recovery Officer Northeast Utilities Service Company P.O. Box 128 Waterford, CT 06385 Mr. J. K. Thayer Recovery Officer, Nuclear Engineering and Support Northeast Utilities Service Company P.O. Box 128 Waterford, CT 06385 Deborah Katz, President Citizens Awareness Network P.O. Box 83 Shelburne Falls, MA 03170 Senior Resident Inspector Millstone Nuclear Power Station c/o U.S. Nuclear Regulatory Commission P.O. Box 513 Niantic, CT 06357 Mr. Allan Johanson, Assistant Director Office of Policy and Management Policy Development and Planning Division 450 Capitol Avenue - MS# 52ERN P. O. Box 341441 Hartford, CT 06134-1441