ML20151E466
| ML20151E466 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 12/31/1987 |
| From: | Pliml G COMMONWEALTH EDISON CO. |
| To: | NRC |
| References | |
| NUDOCS 8804150251 | |
| Download: ML20151E466 (10) | |
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h ZION GENERATING STATION i
ANNUAL OPERATING REPORT 1987 6 8 DOCKETS 50-295 AND 50-304 l
COMMONWEALTH EDISON COMPANY
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TABLE OF CONTENTS I. Submitted in Part III. Zion Station Operating Report. By Environmental Affairs II. Waukegan Memorial Airport Expansion Plans III. Modifications, Tests and Experiments IV. Annual Occupational Exposure Data, submitted under separate cover V .' Challenges to Primary System PORY and Safety Valves I
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II, Waukegan Memorial Airport FAA 5090 Report attached 1042o
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Waukegan Port District . Waukegan Regional Airport Port of Waukegan '
I February 3, 1988 l
Commonwealth Edisen Zion Generating Station 101 Shiloh Blvd.
Zion, IL 60099 Attn: Mr. George Plimi Station Manager, Zian Station Re: Your Letter January 12th, 1988 Waukegan Regional Airport FAA 5010 Report.
Gentlemen:
Attached is the most recent copy of the FAA 5010 report Airport Master recc-d. We wish to draw to your attention the following changes which have not been proparly noted: (1) FAA 5010 report has been changed and is now the 5090 report (2) Item 14; Airport Manager - Robert R. Denison (3) Item 15;-
address 3500 N. McAree Rd., Waukegan, IL 60087 (4) Item 10: Airport Latitude /
42-25-16' North (5) Item 28; Airport Longitude /87-52-10' West.
Yours truly, ldt Robert R. Denison Airport Manager RRD/rm enc.
l Administrative Offices * (312) 244-3133 55 South Harbor Place P 0. Br;x 620
- Wa,skegan. Ilhnois 60079
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III. Modifications, Tests and Experiments Three inodifications and two fuel loads were completed in 1987. Unit One refueling outage started in September 1986 and was completed in March 1987. Unit two Refueling Outage and low pressure turbine change from Westinghouse to Brown Boveri turbines started in March 1987 and ended in August 1987. The Fuel Reloads did not involve any unreviewed safety questions and were performed under the provisions of 10CFR50.59. The reloads did not require a change to the Updated Safety Analysis Report (USAR). The modification of the low pressure turbines from Westinghouse to Brown Boveri turbines will require a change to the USAR.
- 1. Modification M22-1 028 - Description Modification 1-87-028, containment purge and vent valves, RV0005 & 6 were changed from gate valves to butterfly valves. The gate valves required the presence of a vendor representative to get a satisfactory leak test. The new posi-seal butterfly valves are of a better design for sealing and if maintenance is required, it can be performed.by our maintenance personnel. This modification does require a change to the FSAR.
Safety Evaluation Summary A. The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the FSAR is not increased because the values provide containment isolation function for the vacumn and pressure relief line. Dual valve isolation provides redundancy to maintain leakage below technical specification limit of less than 1% per' day. To assure reliability, the valves are inspected periodically.
B. The possibility for an accident or malfunction of a different type than previously evaluated in the Final Safety Analysis Report is not created because the valves are designed to fail safe closed on all accidents, loss of electrical power and loss of air.
C. The margin of safety as defined in the basis for any Technical Specification has not been reduced because the newly installed valves will be tested in accordance with technical specification section 3.9.
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- 2. Modification M22-2-84-040 - Description The reason this modification is being implemented is to increase the safety margin and operability of the RCFC equipment. this modification consists of permanently re-routing the norwal RCFC flow-path through the "accident" portion of the RCFC plenum. This will be accomplished by fixing the flowpath control dampers in the accident mode for both normal and accident operation. Upon completion of this modification, a safety initiation signal will only switch the motor speed from high speed (1200 RPM) to low speed (900 RPM). Also, this modification will consist of the removal of the existing moisture separators and HEPA filters located in the accident pertion of the RCFC plenum upstream of the RCFC cooling coils. These separators and HEPA filters were provided upstream of "future" charcoal filter units to protect from flooding of these charcoal units during the accident environment. However, these "future" charcoal units were not required to be installed since other safety systems within the Zion systems design were adequate to meet the off-site boundary dose rate limits. A thorough review of the FSAR has been completed and no credit in any of the accident analyses for contributory af fects fo containment clean-up from the existing moisture separators and HEPA filters was found. This review was, in part, based upon the results of an evaluation performed by Sargent and Lundy Engineers. This evaluation included a thorough review of the Zion Station FSAR, the updated FSAR, and the Technical Specifications. In addition, the preliminary shielding analysis for Zion Station was reviewed.
Safety Evaluation Summary A. The probability of an occurrence or the consequer.ce of en accident or palfunction of equipment important to safety as previously evaluated in the FSAR as previcusly evaluated in the 4 FSAR is not increased because the probability of a malfunction of the RCFC's has been decreased with this modification. The requirement for dampers to switch from the nornel mode to the accident mode has been deleted. Since the dampers will be in the accident mode during all operations, reliability and operabilities of the RCFC System will be improved. The Operations will not have to rely on the functioning of the dampers. Since the accident analysis found in the FSAR do not address clean-up; removal of the elements does not change operation as analyzed.
B. The possibility for an accident or malfunction of a different type than previously evaluated in the FSAR is not created because a major portion of this system will already be operating in accident mode.
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C. The margin of safety as defined in the basis for any technical specification has not been reduced because this modification increases the margin of safety. Operation of this system has been simplified and is no longer dependent upon the switching of dampers from the normal mode to the accident mode. Dampers will already be in the accident mode during nornel operation .
The design basis of the Technical Specification and referenced FSAR does not take credit for containment clean-up. Therefore, the deletion of this equipment will not decrease the margin of safety as orginally analyzed in the Technical Specification.
- 3. Modification M22-1-85-051 Description Modification 1-85-051 replaced existing source range preamps with new models having greater immunity to electrostatic and electromagnetic noise that is generated inside the containment. The new model is compatible with existing source range electronics and is designed to use existing mounting hardware and electronic connections to facilitate direct replace. This modification does require a change to the USAR.
Safety Evaluation Summary A. The probability of an occurrence or the consequence of an accident, or malfunction of equipment important to safety as previously evaluated in the Final Safety Analysis Report has not increased because the setpoint criterion as listed in the '
PLS document remains at approximately 100 VAC below the operating voltage.
B. The possibility for an accident or malfunction of a different type than any previously evaluated in the Final Safety Analysis Report is not created because the loss of detector voltage annunciator functions in the same manner.
C The margin of safety, as defined in the basis for any Technical Specification has not been reduced because: Technical Specifications do not address the Loss of Detector Voltage l Setpoint.
Eddy current testing on Unit One and Unit Two steam generators was the only testing done at Zion Station. . .
j No experiments were conducted at Zion Station during 1987.
V. Challenges to primary system power operated relief valves and safety l valves.
There were no Challenges mada to either relief or safety values at Zion in 1987.
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Commonw:alth Edison Zion G:n:r: ting St: tion O Zion, Illinois 60099 101 Shiloh Blvd.
Telephone 312/746 2084 March 20, 1988 To: U. S. Nuclear Regulatory Commission Att: Document Control Desk, Washington, D. C. 20555
Subject:
Zion Station Annual Report for 1987 Enclosed is the subject report.
k' G. . Pliml Station Manager Zion Station GJP/jlc cc: M. Holzmer R. Cascarano G. Trzyna W. Stone F. Lentine Master File
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