ML19338C960
| ML19338C960 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Byron, Braidwood, Quad Cities, Zion, LaSalle  |
| Issue date: | 11/29/1977 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Brian Lee COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8009100980 | |
| Download: ML19338C960 (1) | |
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F0V 2 9 1977 Docket Nos. 50-10, 50-237, 50-249, 50-254, 50-265, 50-295, 50-304, 50-373, 50-374, 50-454, 50-455, 50-456, 50-457 Comaonwealth Edison Company ATIN:
Mr. Byron Lee, Jr.
Vice President P.O. Box 767 Chicago, IL 60690 Gentlemen:
The enclosed IE Circular No. 77-15 is forwarded to you for information.
No written response is required... Should you have any questions related to your understanding of this matter, please contact this office.
Sincerely, James G. Keppler Director
Enclosures:
1.
IE Circular No. 77-15 2.
List of IE Circulars Issued in 1977 cc w/encis Mr. B. B. Stephenson,
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Station Superintendent i
Mr. N. J. Kalivianakis, Station Superintendent Mr. N. Vandhe, Plant Superintendent Mr. L. J. Burka, Site Project Superintendant Mr. Gunnar Sorensen, Site Project Superintendent Mr. R. Cosaro, Site
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Project Superintandant I
i Central Files R rodoction Unit NRC 20b
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November 29, 1977 IE Circular No. 77-15 DEGPADATION OF FUEL OIL FLOW TO THE EMERGENCY DIESEL GENEPATOR During surveillance testing on July 14, 1977, personnel at the Cooper Nuclear Station noted a degradation of fuel oil flow to the day tank for the emergency diesel generator. Although the fuel oil transfer pump capacity is 13.8 gpm for each of the two redundant pumps, flov to the day tank for nucher one diesel generator was only 3 gpe. At full load, engine consumption is 4.5 gp=.
Investigation of this occurrence revealed a clogged strainer in a float operated shutoff valve on ths day tank inlet. This valve operates as a backup to level switches which start and stop the fuel oil transfer pumps to maintain normal day tank level. The strainer is an integral part of the float valve assembly and is not shewn on the as-built systec drawings. This valve was manufactured by McDonnell-Millen Company. Station personnel vere thus unaware of the presence of this strainer and did not schedule it for routine strainer cleaning under the preventive caintenance program. Normal testing of the system under the Technical Specification surveillance requiresents does not verify system flow rates.
This occurrence represents an example where the as-built system configuration was not accurately indicated on the system drawings, and that adequate system description was apparently not available to Station personnel.
All holders of construction permits or operating licenses should be aware of the potential for variance between as-built configurations and system drawings. Thi; is especially true for support systems to the engineered safeguards features where all required systen conditions such as pressure and flows may not receive routine testing under the surveillance testing program. It is reco: mended that the following be' considered in your review of this tatter:
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IE Circular No. 77-15 November 29, 1977 1.
A field verification of the drawing against the as-built system configuration should be made for the entire diesel generator fuel oil delivery system from the storage tanks to the engines.
Appropriate changes should be made to the drawings and preven-tive maintenance program to account for any components or configurations not previously covered.
2.
Consideration should be given to revising surveillance test procedures to include a flow test on the fuel oil system to ensure the system continues to meet design specifications.
In addition, the following information relating to the maintenance of fuel oil cleanliness should be considered in your review:
1.
During long-time storage, degradation of fuel oil is a common occurrence. The rate of degradation is not easily predicted since it is a function of the sourc; cf the crude oil, the process utilized in making the fuel (a-g., straight distillation or the method of catalytic cracking), and the conditions under which the fuel oil is stored.
2.
It is known that cer,tain detrimental processes are accelerated in fuel oils when they are in contact with certain metals. The presence of zinc, such as from galvanizing, has a :endency to form soluble soaps in the fuel oil which are deposited on the diesel engine's injection nozzles. A buildup of this deposit vill eventually degrade the engine's performance. The presence of copper promotes the formation of gums which degrade the stored fuel oil and tends to clog filters.
3.
The presence of water in the fuel oil promotes the growth of fungi or slime that also degrades the fuel and has the potential for clogging filters.
No written response to this Circular is required.
If you require additional information regarding this matter, contact the Director of the appropriate NRC Regional Office.
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IE Circular No. 77-15 November 29, 1977 LISTING OF IE CIRCULARS 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 affect:ed Spring Flooding holders of OLs77-02A Potential Heavy 2-16-77 All affected Spring T' oding 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 Assemblies 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 Period During 4-12-77 Holders of Reactor Startup EWR OLs 77-08 Failure of Feedwater 4-13-77 All holders Sample Probe of OLs 77-09 Improper Fuse 5-25-77 All holders of Coordination In BWR BWR OLs or cps Standby Liquid Control System Control Circuits 77-10 vacuum conditions 7-15-77 All holders of Resulting in Damage te OLs Liquid Process Tanks t 't g 6 1 Of 2
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IE Circular No. 77-15 November 29, 1977 LISTING OF lE CIRCULARS ISSUED IN 1977 (Continued)
CIRCULAR SUBJECT FIRST DATE OF ISSUED TO NO.
ISSUE 77-11 Leakage of Con-9-6-77 All holders of OLs tainment Isolation and cps Valves with Resilient Seats 77-12 Dropped Fuel Assem-9-15-77 All holders of BWR blies at BWR Facili-OLs or cps ties 77-13 Reactor Safety Signals 9-22-77 All holders of OLs Negated During Testing and cps 77-14 Separation of 11-22-77 All Power and Contaminated Test Reactor, Water Systems Fuel Cycle, and From Noncontaminated cajor By-product Plant Systems caterial processor facilities with OLs or, cps
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