ML20037B380
| ML20037B380 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Byron, Braidwood, Quad Cities, Zion, LaSalle  |
| Issue date: | 12/13/1977 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Brian Lee COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8009240811 | |
| Download: ML20037B380 (1) | |
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7-0947RALItu 5 t' F
.s Docket Nos. 50-10, 50-237, 50-249,
[ ~ ' 13 1977 50-254, 50-265, 50-295, 50-304,
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50-373, 50-374, 50-454, 50-455, 50-456, 50-457 Consonwealth Edison Company ATTN:
Mr. Byron Lee, Jr.
Vice President P.O. Box 767 Chicago, IL 60690 Centlemen:
The enclosed IE Circular No. 77-16 is forwarded to you for information.
If there are any questions related to your understanding of the suggested actions, p* ease contact titis office.
Sincerely, 7
James G. Keppler Director
Enclosures:
1.
IE Circular No. 77-16 2.
Listins of IE Circulars Issued in 1977
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B. B. Step ~nanson, Station Superictandent N. Kalivianakis, Plant Superintendent
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N. Wandke, Plant
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Superintendent
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L. J. Burke, Site Project Superintendent Gunnar Sorensen, Site Project Superir.tendent R. Cosaro, Project Superintendent Central Files Reproductica Unit NRC 20b PDR Local PDR NSIC
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TIC Anthony Roissan, Esq., Attorney
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December 13, 1977 IE Circular No. 77-16 EMERGENCY DIESEL GENERATOR ELECTRICAL TRIP LOCK-OUT FEATURES Description of Circumstances:
On June 15, 1977 Duquesne Light Company (Beaver Valley 1) reported that during the performance of a test of the diesel-generator (D/G) trip lock-out features in the emergency mode of operation, the D/G output circuit breaker opened when the field voltage trip interlock was tested.
This is contrary to a requirement for this facility that, in the energency mode, all D/G output breaker trips except generator differential and overcurrent be automatically disabled. The engine overspeed trip, which shuts down the diesel engine (but does not affect breaker operation) is also expected to be operable during the energency mode of operation.
An investigation conducted by the licensee disclosed that the unexpr eted opening of the output breaker was due to deenergizing a field voltage sensing relay which was supplied by the vendor but had not been discar -
nected during the on-site acceptance testing of the D/G nor disabled.
by the protection circuitry logic. A redundant field voltage relay which was supplied by the licensee is correctly by-passed during fast start conditions and emergency operation.
A design change was initiated by the licensee which renoved the field voltage trip feature. This was accomplished by disconnecting the set of relay contacts to the trip circuitry of the D/G output breaker.
Subsequent testing of the D/G was performed by the licensee which demonstrated satisfactory operation.
This is an example of an event which resulted from inadequate test procedure performance. The procedures as perforced had not previously identified the type of deficiency described in this circular.
The safety significance of this situation is that the prenodified protection circuitry would have opened the circuit breaker if a loss of field voltage occurred while running in the emergency mode of operation.
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2-December 13, 1977 IE Circular No. 77-16 The D/G Units for the above facility were supplied by the Electro Motive Division (EMD) of General Motors. The model numbers for the D/G Units are:
Engine Model No. 20-645-E4 Generator Model No. A-20-C2 Control Panel Model No. 999-20 All holders of operating licenses or construction permits should assure that the appropriate D/G protection trip circuits are provided with automatic by-pass features that prevent them from negating automatic starting or tripping of D/Gs during fast start or emergency operations.
It is receamended that the following be considered in your reviews of this matter:
1.
Facility procedures should specifically determine whether the protection circuitry that trips the D/G set or the associated output breaker is in accordance with the facility Technical Specifications.
2.
Test procedures for your D/G sets (e.g. acceptance preopera-tional and surveillance tests) should be reviewed to assure that D/G system performance is demonstrated by these tests to be in accordance with related operational requirements specified in the facility Technical Specifications.
3.
Strengthening of ranagement controls should be reviewed as necessary to assure adherence to D/G test procedures by plant personnel.
No written response to this circular is required. If you require additional information regarding this natter, contact the Director of the appropriate NRC Regional Office, s
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LISTING OF IE CIRCUl>JtS ISSUED IN 1977 CIRCULAR SUBJECT FIRST DATE OF ISSUED TO NO.
ISSUE 77-01 Malfunctions of 1-4-77 All holders of Limitorque Valve OLs or cps Operators 77-02 Fotential Heavy 2-15-77 All affected Spring Flooding holders of OLs77-02A Potential Heavy 2-16-77 All affected Spring Flooding holders of cps 77-03 Fire Inside 2-28-77 All holders of a Motor Control OLs and cps Center 77-04 Inadequate Lock 3-17-77 Safeguard Group Assembifes I, II, IV, V, Licensees 77-05 Liquid Entrapment 3-24-77 All holders of in Valve Bonnets OLs and cps 77-06 Effects of Hydraulic 4-1-77 All holders of Fluid on Electrical OL's and cps Cable 77-07 Short Feriod During 4-12-77 Holders of Reactor Startup Bk1 OLs 77-08 Failure of Teedwater 4-13-77 All holders Sample Probe of OLs 77-09 Improper Fuse 5-25-77 All holders of Coordination In BWR Bk% OLs or cps Standby Liquid Control System Control Circuits 77-10 Vacuum Conditions 7-15-77 All holders of Resulting in Damage to OLs Liquid Trocess Tanks Page 1 of 2 L
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t December 13, 1977 lE Circular No. 77-16 LISTING OF lE CIRCUL4JtS ISSUED IN 1977 (Continued)
CIRCULAR SUBJECT FIRST DATE OF ISSUED TO ISSUE NO.
77-11 Leakage of Con-9-6-77 All holders of OLs f
and cps tainment Isolation Valves with Resilient Seats 77-12 Dropped Fuel Assem-9-15-77 All holders 'f BWR o
blies at BWR Facili-OLs or cps ties All holders of OLs 77-13 Reactor Safety Signals 9-22-77 and. cps Negated During Testing 77-14 Separation of 11-22-77 All Power and Contaminated Test Reactor, Fuel Cycle, and Water Systems From Noncontaminated major By-product caterial processor Plant Systems facilities with OLs or cps 77-15 Degradation of Fuel.
12/1/77 All holders of OLs and cps Oil Flow to the Emergency Diesel Generators Page 2 of 2 w
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