ML18052B219
| ML18052B219 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 07/31/1987 |
| From: | Berry K CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| IEB-85-003, IEB-85-3, NUDOCS 8708040354 | |
| Download: ML18052B219 (6) | |
Text
- .
consumers
- Power*.
. *fl!llWElllN&
... llllCHl&AN'S l'IUlliRESS.
- . General Offi~s: 1946 iN~ Parriau ~c>ad, Jackson. Ml 49201 * (617) 788-1636
.. J.uly 31, 1987 Nuclear Regµl~tory CoUIID.issiOn Do'cument *Control *Desk
. Washington, *DC.. 20555 *.*
DOCKET 50-255 -
LICENSE DPR-,20 -
PALISADES PLANT -
- .
- RESPONSE TO REQUEST FOR ADDITIONAL.INFORMATION REGARDING.
. iE ~ULLETIN. 85-03.
Kenneth w *Berry.
Direct~" *
- Nuclear liceruing *
- The NRC. ietter of Ju~e i6,
- 1987 requested* additfonal.informad.on with respect to our responses of *September 4; 1986 arid May 15, 1986 concerning IE Bulletin.
85-03 "ijotor.:..operated. VaTve*. Common Mode* Failures During Plant Transients Due.
to Iuivroper Sw.itch. Settings"~ Enclosed are the requested responses.
- ~*c§~
.. Kenneth W Berry
- . Director,*. Nu<;:lear Lic;ensirig CC Administratp:t,: Region III, NRC.
- NRC ReSident Inspector Palisades*
Attachment
.* 870.*
.
- PDR S0:83E4K 870731 * *.
G
- 05000255
- PDR OC0787.;..0ll3-NL02.
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CONSUMERS POWER *coMPANY Palisades Plant Docket.50-255 - License DPR-20 RESPONSETO 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 Commission's Rules and Regulations thereunde~, Consumers Power Company submit:s our response to the NRC's June 26, 1987 request for additional information with~respect to.
- Cons.umers Power Company's response is dated July 31, 198 7.
CONSUMERS POWER COMPANY.
CONSUMERS POWER COMPANY
- By.
J W Reynolds (Signed) *
- .J W Reynolds, Executive Vice President Energy Supply.
Sworn and subscribed to before me. this: 31st day of July
- 1987.
- Elaine E Buehrer (Signed)
- Elaine E_ Buehrer, Notary Public *
.Jackson County, Michigan
- My coJmnj_ssion *expires October 31, 1989 OA0787-0113-NL02
[SEAL]
I.
. ATT0787-0ll3-NL02
- ATTACHMENT Consumers Power Company
- Palisades Plant Docket 50~255
.. Attachment.
July 31, 1987 3 Pages
. ':.~...
Questio.n 1.:
Unlisted MOV' s, M0-3041, 3045, 3049 and :fo5i; in discharge lines of the safety injection tank.system are shown normally open (fail as is) on.
Drawing M,;.203, Sheet 1, Revision 29.
The possible problem that. the system would be inoperable if the MOV's were left closed inadvertently, should be addressed.
- Based on the assumption *of ina.dvertent equipment..
_operations as required by Action Item.A of the Bulletin, reviSe Attach-ment A, Page 3 of 13, of.the response of ~y 15, 1986 to include these valves.
Response
Prior to Plant* startup (co11llllencing critical approach), an Engineered.
Safeguards System checklist must be completed; checked and approved.
This checklist directs Control Room operators to verify; at the control
.panel, that the valves are in the open position; to lock the key*
1
. _operators in the open posision; arid. remove the keys from the panel. _ The.
keys are then controlled by the Shift Supervisor.
- the circuit breakers
- associated with these valves are also verified to be locked _in. the open position.
Therefore, this checklist eliminates the possibility of these..
valves being inadvertently left closed~.
Attachment A will be revised as requested and will be submitted within an.**
- .update to our May 15, 1986 correl;lpondence.
- This update will be submitted:*
by September 15, 1987 *
. Question 2:
Has water.hammer due to valVe closure been.considered in the.deter-*
. minatio_n of pressure differentials? If not, please explain *. *
Response
The differential pressure calculations for the valves identified by IE.*
Bulletin 85-03 were provided by Combustion Engineering as part of an Owner's Group evaluation.
Water hammer effects were neither considered nor ineluded in the determination of. t_he differential pressures.
However, investigation of this phenomena. indiCate.that:
- 1.
- 2.
- 3.
The severity of water of.the valve (ie; the water hammer).
hammer is dependent on the.operating speed shorter the stroke time the more severe the The pressure wave resulting from water hammer travels at sonic velocities: Therefore, the. transient is of short dµration (several.seconds).
The effects of the pressure wave resulting from water hammer will be reduced due to its energy being dampened out by elbows, tees, branch connections, changes in effective pipe diameter_, expansion joints_ and _the inherent flexibility of the system.
IC0787-0133-NL02
. 2 '
Our review of the.system configuration, operating parameters and valve.
stroke times in conjunction with the above _characteristics, indicate that water hammer is not a concern for these systems.
This contention will be further substantiated during motor operator diagnostic 'testing *. If. *.
. during diagnostic testing there ate no indications of valve damage which_.*.
could have resulted from severe water hammer, the likelihood of past water hammer* occurrences would be minimal.
Question 3:
Pleas_e expand the proposed program for Action* Items B, C and.D of the Bulletin to include the f qllowing details as a minimum:
a) commi.tment to a training program for setting switches, maintaining valve operators, using test equipment and interpreting test
- _results.
b). commitment to justify continued operation of a valve determined to
- _be inope:rable, and c) description of a method possible needed to extrapolate valve stem*
thrust measµred at less. than maximlim differential pressure.
Response
a) Consumers P-ower* has been* actively involved in providing training for its employees *at the Palisades Plant wit_h regard* to the electrical and mechanical *refurbishment/set-up of the Liniitorque motor operators.* To date, two mechanical refurbishments and two electrical wiring and switch setting courses have been completed, another mechanical refur- **
bishment course is scheduled for. August~-* Actual refurbishment/ set-up of the motor operators will be perforined by experienced Babcock &
- Wilcox engineers and field technicians.
In conjunction with and under
- the direction of Babcock & Wilcox, Palisades' employees will gain additional experience as.they assist in the refurbishment of the motor ope:rators.
MOVATS, Inc* has been contracted to provide the testing apparatus and manpower to perform the diagnostic testing of the actuators. *In addition, they will also interpret and provide results for each actuator tested. -.Future testing. of the operators will also be* con-tracted to industry recognized experts, since Palisades will not be purchasing the diagnostic testing equipment.
- b) CPCo does not. anticipate having valves in th~s category, since preliminary engineering studies indicate all valves and opera~ors are of suitable design and construction for the intended purpose.
However, if a situation should arise in which replacement parts cannot be obtained iri. a timely fashion, system operating requirements would be reviewed for normal and emergency situations to.Justify continued Plant operation.
IC0787-0133-NL02
.4 '
~- *¥.
- .. ¥.*~*-...
c) Current plans*are to test all valves identified by IE Bulletin 85-03
- at maximum di~ferential pressure.
In the event testing at full
.3
- differential pressure is not possible, the test will be run at reduced pressure. **In this case, MOVATS' diagnostic equipment will be utilized and the total thrust signature, will be analyzed* to determine the thrust resulting from the valve itself (ie, packing loads, friction, gear efficiency, etc). Calculations will then be conducted to deter-
- mine the.thrust that would result from maximum differential pressure alone.
The sum of the valve thrust and maximum differential pressure thrust shall be less than or equal to the thrust produced by the
- .operator, thus ensuring operability of the valve at maxim\\lm differ-
.... *. ential pressure. *.
The calculation of thrust due to maximum differential pressure will be conducted by MOVATS using equations that.have been verified by actual test data for a given size and type valve.
Question 4:
Please submit a date for planned completion of Action Item F of the.
Bulletin.
The specified due date is January 15, i988.
- Response:*
- Currently, a maintenance outage in which IE.Bulletin 85-03 program actions will be completed is scheduled to begin in October.. 1987.
Final.
documentation verifying completion of the-IE Bulletin 85-03 program at*
the Palisades Plant will be submitted to the NRC.within 60 days of the
.program's completion, but not later than January_l5, 1988~
IC0787-0133-NL02