IR 05000320/1977013
| ML19220B341 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/15/1977 |
| From: | Finkel A, Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML19220B339 | List: |
| References | |
| 50-320-77-13, NUDOCS 7904250652 | |
| Download: ML19220B341 (5) | |
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Reg I Form 12 (Rev Feb 77)
U. S. iiUCLEAR REGULATORY COMMISSION
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OFFICE OF INSPECTION AND ENFORCEMENT
REGION I
IE Inspection Report No:
50-320/77-13 Docket No:
50-320 Licensee:
Metropolitan Edison Company License Ho:
CPPR-66
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Box 542 Priority:
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Readino, Pennsylvania Category:
B Safeguards Group:
Location:
Middletown. Dennsylvania (TMT-21
Type of Licensee:
Type of Inspection:
pnotina. Announced Dates of Inspection:
March 31.1977 De' s of Previous Inspection:
March 28 to Acril 1,1977
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/(/S 77 Reporting Inspector:
A. Finkel, Reactor ' Inspector
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DATE Accompanyi g Inspectors:
NONE DATE DATE DATE DATE Other Accompanying Personnel:
NONE DATE Reviewed By:
_f. c. naynes L-SY") 7
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Reactor Const ion and Engineering Support Branch
, Engineering support section
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o SUMMARY OF FINDINGS Enforcement Action None.
Licensee Action on Previously Identified Enforcement Items Not Inspected.
Design Changes Not Inspected.
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Unusual Occurrences None Reported.
Other significant Findings A.
Current Findings 1.
Acceptable Items The inspector examined relay calibration and trip setting data sheets related to a relay coordination study, as described in the Details of this report. No departures from regulatory re-(Details, Para-quirements or SAR commitments were identified.
graph 3)
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Unresolved Itens The following item has been identified as unresolved.
Relay Coordination Study Calculated Bus Loads Require 77-1 3-01 -
(Details, Paragraph 4)
Review of Overload Condition.
Status of Previously Identified Unresolved Items
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B, Not Applicable.
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Devia tion,s None Identified.
Manacement Interview At the conclusion of the inspection a meeting was held at the site at Metropolitan Edison Company, Reading Office, on March representatives of the licensee organizations.
31,1977, with of the Details Section of this report. consisted of personnel who pose and the scope of the inspection (Details, Paragraph 2), and theThe results of the inspection (as listed in the " Summary of Findings").
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DETAILS 1.
Persons Contacted General Public Utilities Service Corporation
' *J. Torcivia, Senior Project Engineer I. D. Porter. Test Engineer Electrical
- R. F. Fenti. Quality Assurance Auditor Metropolitan Edison Company
- R. D. Stump, Supervisor, Relay Engineering R. W. Bensel, Electrical Engineer R. N. Prabhakar, Supervisor, Generation Quality Assurance E. Kellogg, Quality Assurance Auditor 2.
Scope of Inspection The inspector stated that this inspection was to audit the methods employed by the licensee for perfoming the relay coordination studies and establishing the settings for protective relays associated with safety-related power supplies for Three Mile Island Unit No. 2.
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Relay Coordination Study (Relay Calibration and Trip Set Points)
The licensee stated that the Metropolitan Edison Company is per-feming the safety-related protective relay setting analysis for the 4160 volt systems and higher, while Burns and Roe is perfoming the analysis for the lower voltage systems. Burns and Roe would also perfom the analysis for' all safety-related under voltage re-lays and timers associated with transfer schemes.
The inspector audited that relay calibration and trip setting data sheets, prepared by Metropolitan Edison Company's relay engineering section, for the 4160 volt safety-related systems.
These relay calibrations and trip settings were based on conference Note No.
1055, dated May 20, 1975, of the licensee. The inspector observed that the data sheets contained the calibration and trip settings for each relay on a particular bus, referenced tb requirementsfpro-cedures met in the perfomance of the work, and! each sheet was
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identified by a data sheet control number. The specific data sheets audited by the inspector were as follows:
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Data Sheet Control Number /Date Safety-Related Bus RSN 3589/ February 5,1976
- 2-lE, 2-2E, 2-3E, 2-4E RSN 3606-3607/ April 23,1976 2-lE and 2-2E Units 1-ES, 1-E6, 2-E6, 2-E7 MU-P-1 A, MU-P-18, MU-P-l C, MU-P-I D RSN 3605/ April-21,1976 2-lE and 2-2E Units lE90 and 2 Ell RSN 3589/ April 6,1976 2-lE and 2-2E
- The relays of tie breakers between the 2-lE, 2-2E, 2-3E and 2-4E safety-related buses were also included in the referenced data sheets.
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77-13-01 - Relay Coordination Study (Calculated Bus loads)
During a review of the calculated loads on the 4160 volt safety-related buses, the inspector understood that the Metropolitan Edison Com-pany assumed, for the purpose of the relay coordination study, that the total load carried by a circuit breaker would not exceed the manufacturer's rating. The inspector observed that the licensee had identified a potential condition where the feeder breakers to the 2-lE and 2-2E buses would be loaded about 125% of the manufacturer's rating. This condition could exist if the 2-lE or 2-2E bus is used to supply both the 2-3E and 2-4E buses as is provided in the design (via tie breakers).
The licensee stated that GPUSC had been informed of this possible overload condition. The licensee further stated that this potential overload condition would be reviewed and the resolution of this matter documented.
This item is considered to be unresolved, b
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