ML20214E070
| ML20214E070 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 02/26/1986 |
| From: | Berry K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| IEB-85-001, IEB-85-1, NUDOCS 8603070057 | |
| Download: ML20214E070 (5) | |
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Nswirar Lkenring General Offices: 1945 West Pernall Road. Jackson. MI 49201 e (517) 7881636 February 26, 1986 James G Keppler, Administrator Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -
RESPONSE TO IE BULLETIN 85 STEAM BINDING OF AUXILIARY FEEDWATER PUMPS IE Bulletin 85-01 entitled " Steam Binding of Auxiliary Feedwater Pumps" required Lfcensees to take certain action to detect and/or correct steam binding of the Auxiliary Feedwater Pumps. These actions and Consumers Power Company's responses are as follows:
Action 1.
Develop procedures for monitoring fluid conditions within the AFW systen on a regular basis during times when the system is required to be operable.
This monitoring should ensure that fluid temperature at the AFW pump discharge is maintained at about ambient temperature. Monitoring of fluid conditions, if used as the primary basis for precluding steam binding, is recommended each shift.
This item is not intended to require elaborate instrumentation. A simple means of monitoring temperature, such as touching the pipe, is a satisfac-tory approach.
Response
1.
A requirement for monitoring of the auxiliary feedwater piping has been added to the " Auxiliary Building Plant Data Sheet No. 2".
This data sheet is completed by the Auxiliary Operator each shift (8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />) and is reviewed and signed by the Shift Supervisor.
Action 2.
Develop procedures for recognizing steam binding and for restoring the AFW system to operable status, should steam binding occur.
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James G Keppler, Administrator 2
Palisades Response to IE Bulletin 85-01 February 26, 1986
Response
2.
A section has been added to the system testing attachment to the Feedwater System Operating Procedure (SOP 12). This section specifies the test for determining Auxiliary Feedwater System (AFW) back leakage (temperature by touching). Guidance is also provided for restoring AFW should (a) the piping become hot to the touch, or (b) an AFW pump is found hot to the touch.
(See attached copy of the pertinent pages from S0P 12.)
Action l
3.
Procedural controls should remain in effect until completion of hardware modification to substantially reduce the likelihood of steam binding or until superseded by action implemented as a result of resolution of l
Generic Issue 93.
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Response
3.
The procedure and data sheet change as described above were implemented l
June 1985. The Auxiliary Operator training program has included considera-l tion of steam binding of pumps for a number of years.
l Palisades AFW system consists of two trains or channels.
Back leakage through either of the common AFW Pumps P8A/P8B discharge lines could disable both of those pumps, but would not affect AFW Pump P8C.
Similarly, back leakage t rough P8C discharge piping would not disab?e Pump P8A or P8B.
Discharge piping and mini-flow piping for each train is separate, and suction piping is common for a distance less than 6 feet directly below the Condensate Storage Tank. The AFW piping provides two check valves and a normally closed flow control valve in series in each backflow path.
We have concluded that the new procedural requirements in place and the systen design together provide assurance that AFW system back leakage will be detected and corrected before both trains are adversely affected and, therefore, are not planning any additional hardware nodifications to the system.
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- j Kennath W Berry Director Nuclear Licensing CC Director, Office of Nuclear Reactor Regulation Director, Office of Inspection and Enforcement NRC Resident Inspector - Palisades At tac hmer:t DC0286-0032-NLO2
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CONSUMF.RS POWER COMPANY Palisades Plant Docket 50-255 - License DPR-20 RESPONSE TO IE BULLETIN At the request of the Commission and pursuant to the Atomic Energy Act of 1954 and the Energy Reorganization Act of 1974, as amended, and the Commirsion's Rule and Regulations thereunder, Consumers Power Company submits our response to IE Bulletin 85-01 dated October 29, 1985, entitled. " Steam Binding of Auxiliary Feedwater Pumps." Consumers Power Company's response is dated February 26, 1986.
CONSDERS POWER COMPANY By
/R ax F'W Buckman Vice PreiiTaun g Nuclear Operations Sworn and subscribed to before me this 26th day of February, 1986.
Ku / ] 2 taln / n Elaine E Buehrer, Notary Public Jackson County My commission expires October 31, 1989 OCO286-0032-NLO2
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'o Pete N3 SOP 12 o m m e-Att:chme:t 2 u$b,..,._.,,s. (
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SYSTEM TESTING
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8.
As turbine warms, close drain valves **MV-W510, **MV-W511 and
- MV-W512.
9.
Return **HS-0522B to MANUAL position: Amber lamp ON, white lamp 0FF.
l
- 10. Stop steam driven AFW Pump **P-88.
- 11. Return Key Switch SS-3/**P-8A, **P-8B to the NORMAL position.
- 12. Return **HS-0522B to the AUTO position. White light ON.
I VI.
AUTO TEST MOTOR-DRIVEN AUXILIARY FEEDWATER PUMP **P-8C 1.
Check HS **P-8C on Panel **EC-01 in AUTO, Amber light OFF, White light ON.
2.
Unless flow to the Steam Generators is desired, place Key Switch SS-4/**P-8C in the rear of Panel **EC-11 to TEST."IN TEST **CV-0736A and **CV-0737A" alarm on Panel **EC-11 AFAS/FOGG Status Panel should light.
3.
Place Key Switch SS-5/**P-8C in the rear of Panel **EC-11 momentarily to the TEST position. " AUTO START TEST PUMP **P-8C" alarm on Panel
- EC-11 AFAS/FOGG Status Panel should light.
4.
After time delay, **152-0209 should close, startin3 pump.
5.
Place HS **P-8C to Manual position. Amber light ON, White light OFF.
i 6.
Stop motor-driven AFW pump **P-8C.
7.
Return Key Switch SS-4/**P-8C to the NORMAL position.
8.
Return HS-**P-8C to the AUTO position. White light ON, Amber light OFF.
VII.
TEST FOR CHFCKVALVE BACKLEAKAGE 1.
Verify, by carefully touching the AFW piping near each flow control h
h valve, that there is no backleakage from the steam generators.
(If the piping is cool to the touch, significant backleakage does not f
exist.)
2.
If the AFW piping is hot to the touch, take the following actions:
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2.1 Notify Control Operator and Shift Supervisor.
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2.2 Check temperature of the associated AFW pump (s).
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F Prec N3 SOP 12
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SYSTEM TESTING 2.3 Ytart an AFV pump and flush the hot portions of the AFW piping to the steam generator (s).
2.4 Monitor piping and pump temperatures for reoccurrence of backleakage, qo an '
2.5 If an AW pump is found too hot to touch (Step 2.2) or if high d
piping temperatures reoccur a Work Request / Work Order, to repair a
the leaking valves at the next shutdown, should be issued.
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2.6 If backleakage is sufficient to cause high pump temperatures, d'
isolation of the leakage path with one of the FOGG valves should be considered.
(Backleakage has actually disabled AW pumps by 4
steam-binding at other nuclear plants.) With the backleakage path isolated, the pump and local discharge piping should be vented to refill the pump with cool condensate. The discharge piping should then be flushed to the steam generators and the FOGG valve reopened.
NOTE:
Isolating FOGG valve renders associated flow control valve inoperable and initiates a 72 hrs LC0; see Technical Specification 3.5.
le.
pa0280-1043c-89-154 5
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