ML17158B048
| ML17158B048 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 12/05/1995 |
| From: | Poslusny C NRC (Affiliation Not Assigned) |
| To: | Byram R PENNSYLVANIA POWER & LIGHT CO. |
| References | |
| TAC-M90542, TAC-M95041, NUDOCS 9512110292 | |
| Download: ML17158B048 (6) | |
Text
Hr. Robert G.
Byram Senior Vice President-Nuclear Pennsylvania Power
& Light Company 2 North Ninth Street Allentown, PA 18101 December 5,
199'UBJECT:
REQUEST FOR ADDITIONAL INFORMATION RELATED TO THE ANALYSIS OF CIRCUITS IN THE SUBMITTAL DATED AUGUST 23,
- 1995, SUSQUEHANNA STEAM ELECTRIC STATION, UNITS 1
AND 2 (TAC NOS.
- H90541, H90542)
Dear Hr. Byram:
The staff has completed its preliminary review of the Pennsylvania Power and Light Company's (PP&L) submittal dated August 23, 1995 which addressed the analyses of electrical circuits supplied by GE Nuclear in the design of the Susquehanna Steam Electric Station (SSES),
Units 1
and 2.
Based on this review, the staff has developed a set of questions (enclosed with a list of Typical Affliated Circuits attached) which need to be addressed in the near term to support the staff's completion of its evaluation of the issue related to the isolation of Class 1E circuits from non-Class lE circuits in the SSES design.
Your answers will support the completion of the safety evaluation report currently under preparations This requirement affects 9 or fewer respondents and, therefore, is not subject to the Office of Management and Budget Review under P.L.96-511.
If you need any clarification about the information being requested, please contact me at 301-415-1402.
Docket Nos. 50-387/388
Enclosure:
Request for Additional Information cc w/encl:
See next page DISTRIBUTION:
Sincerely,
/s/
Chester
- Poslusny, Senior Project Manager Project Directorate I-2 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket File PUBLIC PDI-2 Readin SVarga JZwolinski JStolz MO'Brien CPoslusny OGC ACRS
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON> D.C. 20555-0001 December 5,
1995 Hr. Robert G.
Byram Senior Vice President-Nuclear Pennsylvania Power
& Light Company 2 North Ninth Street Allentown, PA 18101
SUBJECT:
REQUEST FOR ADDITIONAL INFORHATION RELATED TO THE ANALYSIS OF CIRCUITS IN THE SUBHITTAL DATED AUGUST 23,
- 1995, SUSQUEHANNA STEAM ELECTRIC STATION, UNITS 1
AND 2 (TAC NOS. H90541, H90542)
Dear Hr. Byram:
The staff has completed its preliminary review of the Pennsylvania Power and Light Company's (PP&L) submittal dated August 23, 1995 which addressed the analyses of electrical circuits supplied by GE Nuclear in the design of the Susquehanna Steam Electric Station (SSES),
Units 1 and 2.
Based on this.review, the staff has developed a set of questions (enclosed with a list of Typical Affliated Circuits attached) which need to be addressed in the near term to support the staff's completion of its evaluation of the issue related to the isolation of Class 1E circuits from non-Class lE circuits in the SSES design.
Your answers will support the completion of the safety evaluation report currently under preparation.
This requirement affects 9 or fewer respondents and, therefore, is not subject to the Office of Hanagement and Budget Review under P.L.96-511.
If you need any clarification about the information being requested, please contact me at 301-415-1402.
Sincerely, Q~ P~1 Chester
- Poslusny, Se ior Project Hanager Project Directorate I-2 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation Docket Nos.
50-387/388
Enclosure:
Request for Additional Information cc w/encl:
See next page
Mr. Robert G. Byram Pennsylvania Power 5 Light Company Susquehanna Steam Electric Station, Units 1
5 2
CC:
Jay Silberg, Esq.
- Shaw, Pittman, Potts 5 Trowbridge 2300 N Street N.W.
Washington, D.C.
20037 Bryan A. Snapp, Esq.
Assistant Corporate Counsel Pennsylvania Power 5 Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 Mr. J.
M. Kenny Licensing Group Supervisor Pennsylvania Power
& Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 Mrs. Maitri Banerjee Senior Resident Inspector U. S. Nuclear Regulatory Commission P,O.
Box 35 Berwick, Pennsylvania 18603-0035 Mr. William P. Dornsife, Director Bureau of Radiation Protection Pennsylvania Department of Environmental Resources P. 0.
Box 8469 Harrisburg, Pennsylvania 17105-8469 Mr. Jesse C. Tilton, III Allegheny Elec. Cooperative, Inc.
212 Locust Street P.O.
Box 1266 Harrisburg, Pennsylvania 17108-1266 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 475 Allendale Road King of Prussia, Pennsylvania 19406 Mr. Harold G. Stanley Vice President-Nuclear Operations Susquehanna Steam Electric Station Pennsylvania Power and Light Company Box 467 Berwick, Pennsylvania 18603 Mr. Herbert D. Woodeshick Special Office of the President Pennsylvania Power and Light Company Rural Route 1,
Box 1797 Berwick, Pennsylvania 18603 George T. Jones Vice President-Nuclear Engineering Pennsylvania Power and Light Company 2 North Ninth Street Allentown, Pennsylvania 18101 Dr. Judith Johnsrud National Energy Committee Sierra Club 433 Orlando Avenue State College, PA 16803 Chairman Board of Supervisors 738 East Third Street
- Berwick, PA 18603
HICB RE UEST FOR ADDITIONAL INFORMATION RAI SUS UEHANNA STEAM ELECTRIC STATION PPEEL SUBMITTAL DATED AUGUST 23 1995 (1)
In the November 15, 1994 meeting, PP8L identified about 250 unisolated circuits in the GE scope of supply associated with the plant computer.
Table 3 and Attachment 1 of the submittal includes only 112 circuits for each unit.
Please discuss this apparent difference.
(2)
Several IE/Non IE interface analyses included the following statement.
GE did not have separate SEP codes for associated cables (Affiliated for SSES) when Susquehanna SES was designed.
GE used the Sep Code of the system from which the signal was developed or Non Sep for associated cables (Affiliated for SSES).
The cabling between the Indicator
& Trip Unit and the recorder is GE Sep Code Non Sep.
This is acceptable.
Does the statement mean no separation of cables and power supplies between class IE and non-class IE components is acceptable (Attachment 1
of the submittal, pages 24, 26, 29, 30, 33, 36, 46).
(3)
The submittal defined PPEL's affiliated circuits (the IEEE 384 equivalent is called an associated circuit) as "non-class IE circuits that are not physically separated or are not electrically isolated from class IE circuits by the acceptable barriers or isolation devices."
The analyses of all 112 circuits, only qualitatively showed acceptable consequences for not providing the IEEE 279 required isolation devises, i.e. failure or faults in the non-IE components (recorder or indicator) or the non-IE power supply do not degrade the class IE components below an acceptable level.
However, the analyses did not evaluate the potential consequences of not having separation between the affiliated circuit components (equipment and cables) and the potential consequences of affiliated circuit cables being routed with other circuits.
(4)
Page 5 of the submittal indicated that the GE generic test on "Neutron Monitoring System Electrical Circuit Interfaces" used 120 VAC and 300 VDC faults except for the Signal Resistor Units (SRUs) and that, electrical isolators have been installed in the SRU interfaces.
However, the analysis of several interfaces with SRUs did not mention electrical isolators in the affiliated circuits.
Please clarify.
(5)
In Table 3, the GE instruments in the affiliated circuits are classified as "N" or "Q" whereas their power supply/input-output classifications are Q,
N, Class IE QP, non-class IE, and QF.
Similarly, the instrument cable separation codes are ESS-l, ESS-2, non-sep, non-class IE, panel wiring, and Ch. Aff., whereas some circuits are listed without a separation code.
PPLL should explain these various classifications and codes and identify the resulting separation of the affiliated circuit cables.
Enclosure
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