ML20210V000
| ML20210V000 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 09/15/1997 |
| From: | Laux J UNION ELECTRIC CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20210V003 | List: |
| References | |
| 50-483-97-05, 50-483-97-5, ULNRC-3649, NUDOCS 9709220217 | |
| Download: ML20210V000 (5) | |
Text
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a fu in M sw t U$I September 15,1997 bVlON Etnernicn l
U. S. Nuclear Regulatory Conunission i
Attn: Document Control Desk Mail Stop Pl 137 i
Washington, DC 20555 0001 ULNRC-3649 Gentlemen:
REQUEST FOR INFORMATION PERTAINING TO EMERGENCY DIESFL GENERATOR ROOM TEMPERATURE LIMITS INSPECTION REPORT NO. 50-483/97005 CALLAWAY PLANT Ref: EA 97168 dated September 9,1997 This responds to Mr. Ilowell's letter dated September 9,1997, which transmitted a request for additional information pertainit g to emergency diesel generator room temperature limits.
None of the material in the response is considered proprietary by Union Electric If you have any questions regarding this iesponse, or if additional information is required, please let me know, Very truly yours, bv.
. V. Laux Manager, Quality Assurance JVUMAR/tmw Attachments: 1) Response to Request for Information
- 2) Bechtel Calculation GM 2-C, Revision 0 (7 pages)
- 3) Bechtel Specification M-018, pages i through 7 (10 pages)
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- 4) Vendor Erwironmental Qualification Report M-018-00821-01
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(Pages 48 55 of 942) 970922 2 70 15
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ULNRC 3649 September 15,1997 Page 2 cc: Mr. Ellis W. Merschoff Regional Administrator U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011 8064 Senior Resident inspector Callaway Resident Omce U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 6507*,
Mr. Barry C. Westreich (2 copies)
Acting Licensing Project Manager, Callaway Plant Omce of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop 13E16 Washington, DC 20555 2738 Manager, Electric Department Missouri Public Service Commission PO Box 360 Jefferson City, MO 65102 Mr. Thomas A. Baxter Shaw, Pittman, Potts, & Trowbridge 2300 N. Street N.W.
Washington, DC 20037 Manager, Plant Support Wolf Creek Nuclear Operating Corporation PO Box 411 Burlington, MS 66839
0 Attachment to ULNRC.3649 September 15,1997 Page1 A. Reauest for Information The documentation indicates a recently performed calculation concluded that with the diesel generator ventilation supply fans not operating (e.g., in pull to-lock) and the diesel generators operating in response to an event at rated load, the temperature in the diesel generator rooms would stabilize at approximately 140'F (assuming the maximum design basis outside ambient temperature). We noted that the calculation j
assumes a hest input of 158,783 Blu/llr for each diesel generator while operating at
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rated load. Plecae provide the basis for this 158,783 Btu /hr heat load assumption."
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Response
l The calculation referenced above is Union Electric Calculation GM 03, revision 0.
As noted on page 6 of 21 of the calculation, the source of the heat input value is
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Bechtel Calculation GM 2 C revision 0 (bottom of sheet 2). GM 2-C quantified the i
net heat input to the room from an Emergency Diesel Generator using empirical data l
from testing performed at Callaway Plant. The heat gain determined in GM 2-C was j
quahtified as heat firom combustion air (976,622 Btu /llr) and heat transfer through j-the building walls (158,783 Btu /Hr). The recently developed calculation GM 03 equated heat loss through the walls as a measure of heat input since the effects of combustion air intake and exhaust have no heating effect once steady state conditions are reached (relatively cool air is drawn into the room for intake and exhaust gases are expelled through insulated lines). Thus, GM 2-C greatly overstated heat input into the room for steady state conditions. Since GM.03's purpose was to produce a more accurate model, including nearly 1 million Btu /llr associated with combustion l
air was inappropriate.
l A copy of Calculation GM 2 C revision 0 is attached for your information.
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B.
Request for information In addition, your staffindicated that with a diesel generator room temperature of 140*F, the diesel generators are capable of providing their rated output during an event. We were unable to identify information in the documentation that supports this position. However, we are aware that the nameplate rating ora the diesel generators indicates th:t they are designed to operate in an environment with the ambient temperature no greater than 122'F. Please provide the necessary documentation / calculation (including any documentation / calculations from the diesel generator vendot) that supports the ability of the diesel generators to supply rated
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Attachment to ULNRC 3649 September 15,1997 Page 2 power output for all accident conditions up to the 140'F temperature of the diesel generator rooms (assuming that 140*F is the maximum temperature expected in the diesel generator rooms without fan operation).
Response
Architect Engineer Bechtel Specification M-018 ' Design Specification For Standby Diesel Generators For The Standardized Nuclear Unit Power Plant System', imposed specific design codes, standards, and service conditions upon the vendor of the diesel generators. Included in the codes and standards listed in section 4.0 of Specification M-018 is IEEE 323-1974 ' Standard for Qualifying Class 1E Equipment for Nuclear Power Generating Stat ons'. This IEEE standard required the vendor, Colt i
Industries, to document qualification to the environmental conditions speci0ed by the purchaser of safety related equipment. The service condition relating to the operation of the diesel generators at an ambient room temperature of 122*F ean be found in section 5.1 of Specification M-018. Section 5.2 of the same specification required
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Colt to guarantee that the diesel generators would operate with a high degree of performance reliability when run at full load in an ambient temperature of 142'F for six hours a day for one week.
Colt's Environmental Qualification Report M-018 00821-01 documents the environmental conditions to which the supplied equipment was tested. This Environmental Qualification report lists the specific temperature profiles to which each class of equipment was qualified. Colt used a stepped temperature profile to qualify the equipment based on the data supplied by Bechtel. The stepped profile was further reflued to include the effects of self heating thus making Colt's temperature profiles more restrictive than Bechtel's specification request. Colt then added a 15'F margin to the specified design temperatures. For example, to ensure reliable diesel generator operr.tlon Colt applied 157 F (142Y + 15'F margin) to each applicable piece of tested equipment using accepted aging practices for the specified 42 hours4.861111e-4 days <br />0.0117 hours <br />6.944444e-5 weeks <br />1.5981e-5 months <br /> of operation. Additionally, Colt applied 137'F (122'F + 15'F margin) to each applicable piece of tested equipment using accepted aging practices for a period of 10,512 hours0.00593 days <br />0.142 hours <br />8.465608e-4 weeks <br />1.94816e-4 months <br /> of operation.
Based on the above and applying accepted thermal aging practices, operation of the ventilation supply fan is not required to ensure the emergency diesel generator will supply its required output at 140'F. Callaway does not intend to change the current design basis for the operation of the diesel generator ventilation supply fan and will maintain room tempuature limits as specified by Technical Specification 16.7.4.
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o Attachment to ULNRC-3649 September 15,1997 Page 3 Copies of Bechtel Specification M 018, pages i through 7 (10 pages) and a copy of Vendor Environmental Qualification Report M-018 00821-01 pages 48 through 55 of 942 (8 pages) are attached for your information.