ML18029A272
| ML18029A272 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 10/31/1984 |
| From: | Vassallo D Office of Nuclear Reactor Regulation |
| To: | Parris H TENNESSEE VALLEY AUTHORITY |
| References | |
| NUDOCS 8411200016 | |
| Download: ML18029A272 (5) | |
Text
Docket Nos. 50-259/260/296 October 31, 1984 Mr. Hugh G. Parris Manager of Power Tennessee Valley Authority 500A Chestnut Street, Tower II Chattanooga, Tennessee 37401
Dear Mr. Parris:
SUBJECT:
REACTOR PROTECTION SYSTEM (RPS)
POWER MONITORING SYSTEM DESIGN MODIFICATION Re:
Browns Ferry Nucl,ear Plant, Units 1, 2 and 3
We have reviewed your response of August 9, 1984 on the above subject.
As discussed with your staff on October 10, 1984, we request the additional information identified in the enclosure.
Since Units 1 and 3 are operating with the modified system and the modification is being implemented on Unit 2 during the current outage, we would like to resolve the questions about the design before the modification is completed.
Therefore, a response within 30 days would be appreciated.
This request for additional information is specific to one licensee.
The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.
Sincerely, Opi;gi;nal si.gned by(
Enclosure:
's stated cc w/enclosure:
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,".r.',-,ugh G. Parris Tennessee Va'iley Authority Browns'erry Nuclear Plant, Units 1,
2 and 3
H.
S.
Sanger, Jr.,
Esquire General Counsel Tennessee Valley Authority 400 Commerce Avenue E
11B 330 Knoxville, Tennessee 37902
!",r. Ron Rogers Tennessee Valley Authority 400 Chestnut Street, Tower II Chattanooga, Tennessee 37401 Mr. Charles R.
Christopher'hairman, Limestone County Commission Post Office Box 188
- Athens, Alabama 35611 Ira L. Meyers, M.D.
State Health Officer State Department of Public Health State Office Building Montgomery, Alabama 36130 Mr. H.
N. Culver 249A HBD 400 Commerce Avenue Tennessee Valley Authority Knoxville, Tennessee 37902 James P. O'Reilly Regional Administrator Region II Office U.
S. Nuclear Regulatory Commission 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303 U.
S.
Environmental Protection Agency Region IV Of ice Regional Radiation Representative 345 Courtland Street, N.
V,.
Atlanta, Georgia 30308
/
Resident Inspector U.
S. Nuclear Regulatory Commission Route 2, Box 311
- Athens, Alabama 35611 Mr. Donald L. Williams, Jr.
Tennessee Valley Authority 400 West Summit Hill Drive, W10B85 Knoxville, Tennessee 37902 George Jo'nes,
- Manager, BFNP Tennessee Valley Authority Post Office Box 2000
- Decatur, Alabama 35602 Mr. Oliver Havens U. S. Nuclear Regulatory Commission Reactor Training Center Osborne Office Center, Suite 200 Chattanooga, Tennessee 37411 James A. Coffey Site Director, BFNP Tennessee Valley Authority Post Offic Box 2000
- Decatur, Alabama 35602
Request for Additional Information Browns. Ferry Nuclear Plants Monitoring of Electric Power to the Reactor Protection System
Reference:
Tennessee Yalley Authority (TVA) letter (J. A. Domer) to the NRC (H. R. Denton), dated August 9, 1984 (1)
TVA's response to question 1 indicates that 110 volt coils on the scram contactors and the I25 volt coil on a solenoid valve are not maintained within their operating capability.
Attachment 2 of the reference letter outlines a test to determine the present need to replace these items which may be part of the integrated plant modification program.
Since the coil failure is not in all cases a
component failure in the safe di rection, we need to know the operating capability of these coils for the undervoltage and overvoltage setpoints to determine if they are adequate to be used during the interim period until they are replaced.
(2)
TYA response to question 2 includes a
5 +
1 second time delay in the trip logic of the alternate supply contactors.
No justification has been provided to show that this time delay is short enough to ensure RPS bus components remain within rated capability.
Most of the components on the RPS buses are provided by.GE and so we expect the selected time delay to be within the 'operating capability rating provided by GE.
Please provide the justification for 5 I second time delay.
(3)
IEEE 279-1971, Section 4.5 includes the energy supply to protective channels as needing to be qualified for Class 1E application to ensure channel integrity.
Per TYA drawing, the MG set output power supply is monitored by Class 1E components in a class 1E cabinet.
However, the control power for these components is supplied from and through the fuses installed in a non-Class 1E cabinet.
This control power should be through Class 1E components and should be contained in a Class.,lE structure.
(4)
The reference lett r does not indicate any expected change in the recommended relay settings based on the test results.
Clarify if the tes: results will be confirmatory and the recommended setpoints will be included in the technical specifications.