ML20126B385
| ML20126B385 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 03/06/1980 |
| From: | Linder F DAIRYLAND POWER COOPERATIVE |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20126B389 | List: |
| References | |
| TASK-06-04, TASK-6-4, TASK-RR LAC-6815, NUDOCS 8003120322 | |
| Download: ML20126B385 (20) | |
Text
_.
g EE.S lit YLA.Vib f*0 WEli CHOL'Elt.1 TA VE f a C, w, O h w asin 54601 March C, 1980 In reply, please refer tn LAC-6P15 DOCKET MO. 50-409 Direct or of Nuclear Reactor Regulation ATTN:
Mr. Dennis L.
Ziemann, Chief Operating Reactors Branch S2 Division of Operatinct Reactors U.
S. Muclear Regulatory Commission Washington, D.
C.
20555
SUBJECT:
?AIRYLAND POWER COOPERATIVE LA CROSSE BOILING WATER REACTOR (LACBUR)
PROVISIONAL OPERATING LICENSE NO. DPR-45 CONTAINMENT PURGING AND VENTING DURING NORMAL OPEP.ATICM
Reference:
(1)
NRC Letter, Ziemann to Linder, dated October 23, 1979.
(2)
DPC Letter, F.
Linder to D.
- Ziemann, (LAC-6683) dated December 7, 1979.
Gentlemen:
By letter of October 23, 1979 (Reference 1), the NRC requested all licensees of operating reactors to provide the NRC staff with information which demonstrates that licensees have initiated action to verify containment purge and vent valve operability.
Licensees were requested to demonstrate by test or by test and analysis that containment isolation (ventilation) valves would shut under postul-ated DBA-LOCA conditions.
At the request of DPC, a preliminary evaluation of the adequacy of containment valve operation was initiated by the valve manufacturer, Allis-Chalmers Corporation.
The evaluation which was based on design information available at the time of the request, indicated that the valves would close at containment pressure differential conditions representative of those resulting from a postulated i worst case design basis accident (Poference A.1).
(See Appendix A.)
However, in order to further confirm the design adequacy of the containment valves, DPC in cooperation with Allis-Chalmers Corpor-ation, embarked on a scale model valve qualification test program in November, 1979, at Langley Research Center, llampton, Virginia.
i r r I
8003120 327/.-
P Mr. Dennis L.
Ziemann, Chief LAC-6815 Operating Reactors Branch #2 March 6, 1980 Air' dynamic flow tests were conducted in which thermodynamic variables and valve shaft torques were measured with special instrumentation and strain gauges.
The model testing program
.was ccmpleted in December, 1979, and a final report was issued to DPC February 21, 1980.
j The test facility consisted of a 300 psi air distrinution system with a compressor station, transonic tunnel and 6b,000 ft 3 nir supply tank.
A 6" butterfly Streamscal valve similar in geometry to the LACBWR 20" valves was mounted to piping in a vent stack plenum chamber immediately downstream of a 900 elbow.
The mounting arrangement and hardware conservatively permitted testing under the most severe inlet flow geometries.
Valve disc torques were contin-0 uously measured at valve disc openings from 0-90 and supply pressures up to 60 psig, or approximately 10 psig above the maximum containment pressure calculated for a LACBWR double-ended recirculatien line i
break.
Three thicknesses of discs were tested to envelope existing valve disc configurations presently supplied with Streamseal valves by Allis-Chalmers Corporation.
The disc shaft was also oriented in plane and 90 out-of-plane with the inlet elbow to quantify the torques produced as a function of shaft orientation.
(The LACEWR l
valves are mounted approximately 450 out-of-plane).
The test results were then used to quantify the torques needed (demand) to close the valves with a range of dynamic flow conditions and valve geometries.
The demand torque was then compared with the operator (supply) torque to ensure the valves would close during a nostulated worst case LOCA.
The testing program and results of some 80 test runs and 4 valve orientations are contained in the following reports:
(1) A-C's Test Report VER-0209, dated December 17, 1979 (Reference A.2); (2) A-C's summary report "LACBWR Containment Isolation / Ventilation Valves",
dated February 11, 1980, Rev. 01 (Reference'A.3); and (3) DPC's summary evaluation of A-C's test results and conclusions (Reference q
A.4).
A description of the LACBWR containment ventilation system and valves is contained in References A.4 and A.S.
A-C has concluded from the tests that the valves vill close from the fully open position with either the flat side or the curved side of the' disc facing the flow when exposed to pressure ramp conditions representative of a design basis accident.
Conservatively assuming the valves are signaled to close by a high containment building pressure of 5 psig, closure will have been completed in approximately 1.8 seconds or loss.
Closure time is based on the maximum closure time measured during numerous operational-tests.
The LACDWR valves are installed with discs that have the curved side oriented toward the upstream (LOCA) direction of flow.
With the discs conservatively oriented in this direction, flow induced forces tend to close the valves from a rotational position of 90 open to 2-
-Mr..Donnis.L. Ziemann, Chief LAC-5815 Operating Reactors Dranch #2 March 6, 1980 approximately 35 open.
The operator spring also tends to assist in closing the valve to a valve position of approximately 35 open at which point the spring forces act alone in completing the valve closure stroke.
The test' data, in fact, confirms that the valves will close from a 0
90 full open position at dynamic flow supply pressure of 60 psig when'the disc is oriented with the curved side upstream as they are presently installed at LACBWR.
Maximum shaft torques are predicted to be 1300 ft-lbs. or 63.4% of the shaft rating.
The maximum torque to which the operator could be subjected is approximately
~
2500 ft-lbs. or 60% of the valve operator rating of 4,167 ft-lbs (Reference A.6).
When the lower predicted containment pressure of 20 psig is used to determine shaft and operator torques, the design margin.is even greater.
It is also believed that debris or duct-work will not be carried into the valves during a design basis accident since the valves are mounted directly to 20" schedule 20 pipe.
The piping is capable.of withstanding approximately 400 psig external pressure before collapse.
A collapse of the ductwork at low pressure during a DDA would produce a beneficial effect in that j
the pressure to which the valves are exposed would be reduced.
The i
redundancy of the series valves would help ensure proper closure, j
Therefore, operating the ventilation system with'the valves in the fully open position results in a substantial safety margin for oper-ation of.the valves under the'most severe postulated LOCA conditions.
DPC has ennrated since late in December 1979 wid1 de valves in die fully closed pos ition.
Periodic venting of the containment building has been necessary to exchange air in the building.
The venting is re-quired to reduce humidity, contaminants and heat buildup in the con-tainment building and forced circulation pump cubicles through which cool air must' he circulated.
In some cases, necessary work has not bean able to proceed because of the need for ventilation.
Unre-stricted personnel access in.and out of containment building work areas during reactor operation must be maintained to permit personnel
-to carry out their necessary job functions.
Since we believe the series of dynamic flow tests have shown that there is. substantial safety margin for operation of the valves during postulated design basis accidents, we are planning to resume operation with the valves in a fully open position.
Sinultaneously, we are sub-mitting for review copies of the Allis-Chalmers Test Report and DPC summary.
This action is based on the determination that the valves will close as designed.
_ 3_
i l
I
~
l g
-Mr. Dennis.L. Ziemann, Chief LAC-6815 Operating Reactors Branch #2 March 6, 1980 The information discussed in this letter and the results presented in referenced reports ( Appendix A) has been reviewed by the IACBWR Operations and Safety Review Committees with f ull concurrence with the conclusions and the action to resume normally open ventilation valve status.
If you have any questions regarding this submittal, please let us know.
Very truly yours, DAIRYLAND POWER COOPERATIVE j
Frank Linder, General Manager FL: CMA: a f CC:
J.
Keppler, Reg. Dir., NRC-DRO III
Enclosures:
Appendix A A-C Test Report i
i i,
\\i
!l J :
il i
(
3-4
e e'
Mr. Dennis L.
Ziemann, Chief LAC-6815
(
Operating Reactors Branch.#2 March 6, 1980 J
APPENDIX A l
b CONTAINMENT VENTILATION VALVES y
k References & Transmittals h
f b
A.1 Allis-Chalmers Letter, Randall to Angle, DPC, dated
[
July 23, 1979 (A-C confirmation that LACBWR Containment Ventilation valves will operate at design conditions of b
66.7 psia).
9 A.2
" Test Report on an Allis-Chalmers 6" Streamscal Butterfly i
Valve in Air Concerning Nuclear Containment Isolation Valves".
A].lis-Chalmers Report VER-0209, dated December 17, 1979.
A.3 "LACBWR Containment Isolation / Ventilation Valves", A-C Summary Report, dated February 11, 1980, Rev. 01.
N I!
A.4 DPC Summary Evaluation of Allis-Chalmers 2/11/80, Rev. 01, Report, dated March 6, 1780, Rev.
O.
E p
A.5 DPC Letter, Linder to Ziemann, LAC-6104, February 1,
- 1979,
{}
(Justification for operating LACBWR with open ventilation p
i valves).
A.6 Bettis Corp. Letter, Reed to Angle, DPC, dated November 2, i5 1979 (Design information on LACBWR Bettis operators).
t Fr i
li r
i-l J
(
li
)
i h
1 L
.h JT 1
S.t y
SUMMARY
EVALUATION OF ALLIS-CHALMERS REPORT, "LACBWR CONTAINMENT ISOLATION-VENTILATION VALVES",
DATED 2/11/80 The testing program and results of some 80 test runs and 4 valve orientations are contained in the following reports:
(1) A-C's Test Report VER-0209, dated December 17, 1979 (Reference A.2); (2) A-C's f
summary report "LACBWR Containment Isolation / Ventilation Valves",
dated February 11, 1980, Rev. 01 (Reference A.3); and (3) DPC's i
summary evaluation of A-C's test results and conclusions (Reference A.4).
A description of the LACBWR containment ventilation system and valves is contained in References A.4 and A.S.
Air dynamic flow tests were conducted in which thermodynamic variables and valve shaft torques were measured with special instrumentation and strain gauges.
The model testing program was completed in December, 1979, and a final report was issued to DPC February 21, 1980.
The test facility consisted of a 300 psi air distribution system 3 air with a compressor station, transonic tunnel and 65,000 ft supply tank.
A 6" butterfly Streamseal valve similar in geometry to the LACBWR 20" valves was mounted to piping in a vent stack plenum chamber immediately downstream of a 900 elbow.
The mounting arrangement and hardware conservatively permitted testing under the most severe inlet flow geometries.
Valve disc torques were contin-uously measured at valve disc openings from 0-900 and supply pressures up to 60 psig, or approximately 10 psig above the maximum containment pressure calculated for a LACBWR double-ended recirculation line break.
Three thicknesses of discs were tested to envelope existing valve disc configurations presently supplied with Streamseal valves by Allis-Chalmers Corporation.
The disc shaft was also oriented in 0
plane and 90 out-of plane with the inlet elbow to quantify the torques produced as a function of shaft orientation.
(The LACBWR 0
valves are mounted approximately 45 out-of-plane).
The test results were then used to quantify the torques needed (demand) to close the valves with a range of dynamic flow conditions and valve geometries.
The demand torque was then compared with the operator (supply) torque to ensure the valves would close during a postulated worst case LOCA.
The above entitled report is a revised analysis (Rev. 01) of the adequacy of the LACBWR A-C 20" Streamscal Butterfly Valves to close during a postulated worst case LOCA.
Four test cases are reported:
two at differential pressures'of 20.and 30 psi with the flat side of the disc upstream (toward containment volume) and two at differential pressures of 20 and 30 psi with the curved side of the disc upstream.
The four LACBWR valves are installed with the curved side facing upstream.
-l'-
1
2 A-C has concluded from the tests that the valves will close from the fully open position with either the flat side or the curved side of the disc-facing the flow when exposed to pressure ramp conditions representative of a design basis accident.
Conservatively assuming the valves are signaled to close by a high containment building pressure of 5 psig, closure will have been completed in approximately 1.8 seconds or less.
Closure time is based on the maximum closure time measured during numerous operational tests.
The LACBWR valves are installed with discs that have the curved side oriented toward the upstream (LOCA) direction of flow.
With the discs conservatively oriented in this direction, flow induced forces tend to close the valves from a rotational position of 90 open to approximately 350 open.
The operator spring also tends to assist in closing the valve to a valve position of approximately 350 open at which point the spring forces act alone in completing the valve closure stroke.
The test data, in fact, confirms that the valves will close from a 900 full open position at dynamic flow supply pressure of 60 psig when the disc is oriented with the curved side upstream as they are presently installed at LACBNR.
Maximum shaft torques are predicted to be 1300 ft-lbs. or 63.4% of the shaft rating.
The maximum torque to which the operator could be subjected is approximately 2500 ft-lbs. or 60% of the valve operator rating of 4,167 ft-lbs.
(Reference A.6).
When the lower predicted containment pressure of 20 psig is used to determine shaft and operator torques, the design margin is even greater.
It is also believed that debris or duct-work will not be carried into the valves during a design basis accident since the valves are mounted directly to.20" schedule 20 pipe.
The piping is capable of withstanding approximately 400 psig external pressure before collapse.
A collapse of the ductwork at low pressure during a DBA would produce a beneficial effect in that the pressure to which the valves are exposed would be reduced.
The redundancy of the series valves would help ensure proper closure.
Therefore, operating the ventilation system with the valves in the fully open position results in a substantial safety margin for oper-ation of the valves under the most severe postulated LOCA conditions. -
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