ML20235X144
| ML20235X144 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 09/25/1987 |
| From: | Sieber J DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML20235X146 | List: |
| References | |
| IEB-85-003, IEB-85-3, NUDOCS 8710190231 | |
| Download: ML20235X144 (15) | |
Text
-
I i
y USNRC-DS (412) 393 6000 One Oxford Centre f,(Gran Strut September 25, 1987' 9 p,S279 U.
S. Nuclear Regu)atory Commission Attn:
Document Control Desk
' Washington, DC 20555
Reference:
Beaver Valley Power Station, Unit:No. 1-and No. 2 BV-1 Docket No. 50-334, License.No. DPR-66 BV-2 Docket No. 50-412 IE Bulletin No. 85-03; Motor Operated Valve Common Mode i
Failures During Plant Transients Due to Improper Switch i
Settings, Responses to Requests for Additional Information l
l-Gentlemen:
The attachments to this letter are submitted in response to the Requests for Additional Information, dated August 21, 1987 and September 9,
1987.
The BVPS-1 and the BVPS-2 responses are provided separately in Attachments 1 and 2, respectively.
If you have any questions regarding this submittal, please l
contact myself or members of my staff.
1 Very.truly yours, Lk%~- -
J. D. Sieber l
Vice President, Nuclear i
Attachments l
cc:
Mr. F.
I. Young, Sr. Resident Inspector (Unit 1) l Mr. J. Beall, Sr. Resident Inspector (Unit 2) l Mr. W. T. Russell, NRC Region I Administrator Mr. P. Tam, Project Manager Director, Safety Evaluation & Control (VEPCO)
Mr. R.
J. Kiessel, NRR 8710190231 870925
{
PDR ADOCK 05000334 P
/
40 l
ATTACHMENT 1 BVPS-1. RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION ON IE BULLETIN 85-03 J
Comments and questions directed to BVPS-1 are addressed below l
in the order: requested.
j l
(1)
Question i
i Unlisted MOVs. FW-158A,
-158B and
-158C are shown normally-1 open on UFSAR Figure 10.3-5, Rev.
4 (1-86), in discharge l
lines from the :AFW pumps to the steam generators.
They.are-1 downstream from listed and normally'open MOVs FW-151A through j
FW-151F.
Please explain. this apparent omission, or revise j
Table 1
of the response of 05-16-86 to include ' valves 4
f FW-158A, -158B and 158C I
Response
MOV-FW-158A, B
C are not included in this evaluation
.]
because they are administratively controlled by being locked
)
in the open safety position and the motors are electrically I
i disabled.
)
1 (2)
Question Unlisted MOV MS-105 is shown normally open on UFSAR Figure
?
10.3-1, Rev.
4 (1-86),
in the steam line from the steam
+
generators to the auxiliary feedwater pump turbine, FW-T-2.
Please explain this apparent omission, or revise Table 1 of the response of 05-16-86 to include MOV MS-105.
]
Response
MOV-MS-105 is not included in this evaluation because it is normally-open and not required to change position to ensure safe shutdown of the plant.
In
- addition, steam unavailability to-the turbine driven feed pump is annunciated in the control room if either MOV-MS-105 or the turbine trip I
throttle valve are not fully open.
l (3)
Question MOV CH-115B is shown normally open to take charging pump 1
suction from the RWST on UFSAR Figure 9.1-1A, Rev.
4, I
(1-86).
Parallel MOV CH-115D is shown normally closed.
According to Table 1.of the response of 05-16-86, both of 4
these valves are closed for normal system operation.. Please l
resolve this apparent discrepancy.
A further consideration is that similarly located MOVs in other Westinghouse three-loop plants are shown normally closed.
f l
Y - -
- N
i
' ATTACHMENT ~ 1 Page 2 (3)
Response
MOV-CH-115 B & D are both normally closed.
They both open on a
safety injection signal to provide borated water from the RWST.
UFSAR Figure 9.1-1A will be revised to show the correct alignment.
(4)
Question Although the following MOVs are called normally closed in-Table 1
of-the response of 05-16-86, they are.shown normally open on UFSAR Figure 6.3-1, Rev.
3 (1-85).
We note that these MOVs are shown normally closed on S&W Drawing 12241-RM-87A-19 for Beaver Valley Unit 2 and on P& ids for other Westinghouse three-loop plants.
Please resolve this.
I apparent discrepancy and check other MOVs as well.
I
]
Response
1 MOV-SI-867 A,
B, C
& D are normally closed.
UFSAR Figure 6.3-1, Revision 3,
Sheet 1,,
incorrectly shows these valves as normally open.
This figure will be revised.
These valves are normally closed and open only after SIS actuation.
(5)
Question Has water hammer due to valve closure been considered in the i
determination of pressure differentials?
If not, please explain.
Response
Valve induced water hammer was not considered to be a
relevant factor because it is a
transient condition that i
occurs primarily after a
rapid valve closure.-
Valve l
specifications for BVPS-1 and BVPS-2 include a design margin above maximum differential pressure to assure valve j
operability for concerns such-as water hammer.
Operator i
sizing criteria enveloped this design differential pressure l
to assure valve operability.
BVPS-1 ~ plant operating
)
I experience has not indicated that valve induced water hammer will occur with moderate closing speeds (7-10 seconds).
Based on the similarity of piping. runs on BVPS-1 and BVPS-2, valve specification design
- criteria, and dynamic testing performed on BVPS-2, the potential for. valve induced water hammer has not been demonstrated as a concern.
In addition, this transient type was not a requirement in the plant design basis.
.1
_ ____-_A
ATTACHMENT 1 Page 3 (6)
Question Listed MOVs FW-151A through FW-151F of the AFW System are three-inch globe valves.
We have been advised recently that the MOVATS data base does. not include. globe valves with i
orifice sizes less than 1.75 or ' greater than 2.0 inches.
Will representative samples of these valves be tested at full differential pressure?
Response
The globe valves at locatione MOV-FW-151A through F are normally open with flow under the seat design and they remain fully or partially open after receipt of an actuating signal.
Therefore, valve operation against full differential pressure is not required to perform the valves safety I
function.
In addition, the valve manufacturer did close the valve against 1,445 psi to verify motor operator output for i
seat tightness.
This test is more severe-than the maximum system pressure differential identified for the valves' location.
Finally, the condition of any one of these valves
{
not being in the fully open position is annunciated in the control room.
(7)
Please expand the proposed program for action items b, c and d
of the bulletin to include the following details as a minimum:
(7a) Question commitment to a
training program for setting
- switches, maintaining valve operators, using signature testing equipment and interpreting signatures,
Response
DLC Maintenance supervision, performing MOVATS testing, have been trained by MOVATS personnel and have used the MOVATS equipment for setting valve operators on BVPS-1.
(7b) Question commitment to justify continued operation of a
valve determined to be inoperable, and
Response
In the event a valve listed in Table 1 of BVPS-1 response of 5/16/86 is determined to be inoperable, corrective maintenance procedures will be used to correct the problem and the valve will be evaluated against the appropriate Technical Specification requirements.
l i
ATTACHMENT 1 Page 4 (7c) Question description of a method possibly needed to extrapolate valve stem thrust measured at less than maximum differential pressure
Response
We_ will continue to use the data from our MOVATS measuring equipment to confirm that the operator output for the valves listed in Table 1
of BVPS-1 response of 5/16/86 is in t
accordance with the required calculated maximum unseating thrust.
We will then confirm the conservatism of our calculated thrusts by comparing them with measured _ data j
supplied from the MOVATS Inc.
test data base.
1 1
i i
l l
j l
l
i s
ATTACHMENT 2 BVPS-2 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION ON IE BULLETIN 85-03
References:
a)
Letter 2NRC-6-046 dated May 13, 1986 J. J. Carey to Dr. Thomas E. Murley b)
Letter 2NRC-6-090 dated August 15, 1986 l
J. J. Carey to Dr. Thomas E. Murley c)
Letter 2NRC-7-151 dated May 29, 1987 J.
J. Carey to William T. Russell d)
Letter 2NRC-7-189 dated July 31, 1987 J. J. Carey to William T. Russell Comments and questions directed to BVPS-2 are addressed below in-the order requested.
Please note this information request' l
acknowledged receipt of References (a) and (b) but excluded later Referenced (c) and (d).
Attached Reference (d) provided the final report for IEB 85-03 which contained the tables enclosed in Reference-j (b).
l 1
(1) Question l
MOVs LCV-115B and LCV-115D are shown normally open to take charging pump suction from the
According to Table 1 of the response of 08-15-86, both of these valves are to open on safety.
signal.
Please resolve this apparent discrepancy.
A further consideration is that similarly located MOVs in l
other Westinghouse three-loop plants are shown normally closed.
Response
MOV's 2CHS*LCV115B and LCV115D are normally closed and open on safety injection signal as stated in Reference (d).
The I
valves are shown as open because the philosophy used to I
develop flow diagrams was to show valves in their position j
when that portion of the system is operating.
(2) Question Unlisted MOVs
- 840, 836, 869A and 869B are shown normally closed in discharge lines of the HPSI (charging) pumps to cold and hot
- legs, in the upper left quarter of S&W Drawing 12241-RM-87A-19.
Similar MOVs-836, 869A'and 869B'of the HPSI System for Beaver Valley 1
are included in Tab'.e 1 of the Duquesne Light
Response
of 05-16-86 for that unit.
Please revise Table 1
of the response of 08-15-85 for Unit 2 to include these valves, or justify their exclusion, w___ _ _
I ATTACHMENT.2 Page 2 1
, Response MOV's 2 SIS *MOV836, 869A and 869B are not included in this evaluation because they are normally closed with power removed to prevent spurious action of the valves.
{
MOV 2 SIS *MOV840 is the High Head Safety Injection Cold Leg f
Throttling Valve and is located in the bypass line around the normally de-energized MOV 2SISMOV*836.
The additional information needed for Tables 1, 3 and 4 of Reference (d) is attached.
It is isolated upstream by normally closed solenoid valve 2 SIS *HCV868A.
Therefore, spurious valve action will not affect system operation.
As stated in revised Table 3, this valve was only statically tested since it is not required to operate on safety signal.
(3)
Question The following MOVs of the HPSI System are not included in Table 1
of the response of 08-15-86.
However, similarly located MOVs of another Westinghouse three-loop plant are listed for inspection in accordance with bulletin requirements.
Please revise Table 1 to include these MOVs, or justify their exclusion.
As required by Action Item a of the
- bulletin, consider the effect of inadvertent equipment operations.
(3a) Unlisted MOVs
- 8130A, 8130B, 8131A and 8131B are shown normally open in series in a crossover line providing suction for the charging
- pumps, in Zone G-6 of S&W Drawing i
12241-RM-79D-16.
(3b) Unlisted MOVs
- 8132A, 8132B, 8133A and 8133B are shown normally open in series in a crossover line on the discharge side of the charging
- pumps, in Zone F-3 of the drawing identified above.
Response
MOV's 2CHS*MOV8130A,
- 8130B, 8131A,
- 8131B, 8132A,
- 8132B, 8133A, and 8133B are not included in this evaluation because they are normally open and de-energized to preclude inadvertent spurious valve operation.
(4)
Question Unlisted MOV 841 is shown normally
- open, in series with listed MOV 867A (normally closed) and in parallel with listed MOV 867B (normally closed).
Refer to Zone I-3 of S&W Drawing 12241-RM-87A-19.
Listed MOVs 867A and 867B are in parallel to ensure discharge of the'HPSI pumps to the RCS cold legs.
It appears that added protection caused by the parallel
- AT')'ACHMENT 2 Page 3 (4) arrangement would be nullified if unlisted MOV 841 were to'be left closed inadvertently.
Please revise Table 1 of.the response' of 08-15-86 to include this valve,.or justify its exclusion.
Response
MOV 2 SIS *MOV841 is not included in this evaluation because it is normally open with power removed to prevent spurious valve operation.
(5)
Question Has water hammer due to valve closure been considered in the determination of pressure differentials?
If not, please explain.
Response
Valve induced water hammer was not considered to be a
relevant factor because it is a
transient condition that occurs after a rapid valve closure.
Valve specifications for BVPS-1 and BVPS-2 include a
design: margin above maximum differential pressure to assure valve-operability for concerns such as water' hammer.
operator sizing criteria enveloped this design differential pressure to assure valve operability.
BVPS-1 plant operating experience has not l
indicated that valve induced water hammer will occur with mode;4te closing speeds (7-10 seconds).
Based on the similarity of piping runs on BVPS-1 and BVPS-2, valve specification design criteria, and dynamic testing performed on BVPS-2, valve induced water hammer has not been demonstrated as a
concern.
In
- addition, this type-of transient was not a requirement in the plant design basis.
(6)
Please expand the proposed program for action items b, c and d
of the bulletin to include the following details as a minimum:
(6a) Question commitment to a
training program for setting
- switches, maintaining valve cperators, using signature testing i
equipment and interpreting signatures,
Response
DLC Maintenance supervision have been trained by MOVATS personnel and have used the MOVATS equipment for setting valve operators on BVPS-2.
y
. e/
o NTTACEMENT 2
^
Pagel4
~
(6b) Question i
commitment.
to justify continued operation. of a
valve i
determined.to be inoperable, and' Response =
l In the ~ event a
valve-listed:'in' the enclosed Table l'for BVPS-2 is determined.to'be inoperable,' corrective maintenance procedures' will. be used to~correctsthe problem 1and the valve:
will' be evaluated against;, the
. appropriate Technical Specification requirements to justify continuing it -in operation.
(6c) Question description of a method possibly needed to extrapolate valve stem thrust measured. at less than maximum differential l
pressure.
- l
Response
This need has not occurred at BVPS-2 to date.
As stated in Reference (d),
Item C, all Bulletin-related valves have been tested under maximum differential pressure conditions to the extent practical and found, acceptable..This information was provided in Tables 1
and' 3.
Additionally, as stated in Reference (d),
all rising stem safety-related. torque and i
limit switch seated valves have been. tested by DLC using
]
MOVATS and found acceptable.
BVPS-2 will. consider the use of 1
MOVATS data base to verify proper MOV operability as future l
needs occur.
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