ML20083D620
| ML20083D620 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 12/23/1983 |
| From: | Bradley E PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8312280169 | |
| Download: ML20083D620 (6) | |
Text
_ _ _
s PHILADELPHIA ELECTRIC COMPANY 23O1 M ARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101 EDW ARD G. W AU ER, e R.
g gy
- ' ::::.'::,":...e..
EUGENE J. BR ADLEY
.ss........
.s.,
DON ALD SLANKEN December 23, 1983 RUDOLPH A. CHILLEMI
{2 E. C. MI R M M A LL g
T. H. M A H E R CO R N E LL
.) )
PAUL AUERB ACH asssstamr e.m.nas c.wms.6 EDW ARD J. CULLEN, J R.
THOM AS H. MILLER, J R.
IRENE A. McMCNN A A ssistani covas.L Mr. A.
Schwencer, Chief Licensing Branch No. 2 Division of Lit.
1g U.
S. Nuclear Regulatory Commission Washington, D.C.
20555 Subjcet:
Limerick Generating S'.ation, Units 1 & 2 Equipment Qualification Branch Open Item (SER Open Item #6)
References:
1.
Letter from E. J. Bradley (PECO) to A. Schwencer (NRC) dated 10/5/83 Pro'.iding Information on Qualification of ADS Accumlators 2.
Telecon between L.
Kintner (NRC), D. Reiff (NRC)
J. T. Robb (PECO) and C. W. Wiedersum (PECO) on 12/19/83.
Dear Mr. Schwencer:
The attached FSAR page changes modify the response to NRC RAI 271.2 as discussed in the reference 2 telecon. These page changes close out the portion of the referenced open item dealing with ADS accumulators.
The information contained on these draft FSAR page changes will be incorporated into the FSAR, exactly as it appears on the attachments, in the revision scheduled for January 1984.
Sincerel,
I Eug e J.
Bra 1 /
JTR/gra/122183245 L
Attachment Copy to: See Attached Service List (3","'
8312280169 831223 L
PDR ADOCK 05000352 I
E PDR
cci, Judge Lawrence Drenner (w/o enclosure)
Judge Peter A. Morris
(
)
Judge Richard F. Cole
(
)
Troy B. Conner, Jr., Esq.
(
)
)
Ann P. Ilodgdon, Esq.
(
Mr. Frank R. Romano
(
)
)
Mr. Robert L. Anthony
(
)
Mr. Marvin I. Iawis
(
)
Ms. Phyllis Zitzer
(
)
Charles W. Elliott, Esq.
(
)
Zori G. Forkin, Esq.
(
)
Mr. Thanas Gerusky
(
)
Director, Pennsylvania unergency Manaycment tgjen:y (
)
Mr. Steven P. Hershey
(
)
Angus Inve, Esq.
(
)
Mr. Joseph H. White, III
(
David Wersan, Esq.
(
)
)
Bobert J. Sugannan, Esq.
-(
)
Martha W. Bush, Esq.
(
l 1
Spence W. Perry, Esq.
(
)
)
l Jay M. Gutierrez, Esq.
(
Atcmic Safety and Licensing Appeal Doard
(
)
l Atanic Safety and Licensing Doard Panel
(
)
Docket and Servico Section
(
)
?
9 9
0 iL
'(
-ORIkO.ONL.T.
~
po t,
MS FSAR Tg pf,e, k p T @ g g g V
. QUESTION 271,2 In accordance with Section 3.10.2 of the Limerick SER, the NRC staff has begun its review of information provided in the FSAR responding to the requirements of NUREG 0737,. Item II.K.3.28
" Qualification of ADS Accumulators".
We find that additional information is needed to complete our review.
Please provide the following information.
1.
Define the basis for the allowable leakage criteria for'the ADS accumulator system (e.g., boundary conditione, environmental, and sei.mic parameters, operator interface, margin, etc.).
2.
What margin is.in the allowable leakage criteria to account for possible increase in leakage resulting from the effects of a harsh environment and/or a seismic event?
3.
Provide a statement that test and/or analysis performed verified that a harsh environment and/or seismic event would not increase the leakage rate.
4 '.
Define the periodic leak testing of the ADS accumulator system, including the time interval between these leak. tests, and a concise description of the test proceddre empic,yed.. -
5.
Provide a ' confirmatory statement that the backup system will meet the overall regulroments of the ADS system.
~
6.
Provide a concise dest.ription of the alarms and instrumentation associated with the ADS accumulator system and backup system.
~7.
Provide a concise description of the tests performed on the backup system and their frequency.
8.
Provide a concise description of the surveillance to be performed, including the frequency, of alarms associated with the ADS accumulator system (and backup system, if
. applicable).
9.
Piov'ide a statement that test and/or analysis will be
~
performed to verify that leakage will not prevent-the ADS from performing as required.
- 10. Provide proposed technical specifications for Limerick to specify the following.
ADS leak test frequency Allowable leakage rate 271.2-1 Rev. 26, 11/83
~
o.
-u.
s o
f
~
,_,j u UUd M,
Actions to be taken, in a specified time frame, should the allowable leakage rate be exceeded.
- 11. Provide a statement that' confirms that the complete ADS accumulator system and associated equipment and control circuitry are a part of the Limerick Environmental.
/ Qualification Program and will be qualified to accommodate
..7,the a'ffd' cts ofrendearez compatiblecwi.th;the. environment 4L' 4
..,.. condittd./ snd"p'ostulhtied Taccidsntstasustated:-in s
,,, s.
P
.v w.
-..u..
T n' ass 6ci'ated with' normal operation.maintenante,..'"
c
.. P.,.
'i
....g
...'eria.'2"andP4Jof> Appendix'A.of.10iCFR.50.
,.e.
Crit m..
s.
- 12. Provide a P&ID of the ADS Accumulator System including the gas bottle supply.
RESPONSE
The basis for the allowable leakage criteriu applies only to 1.
the short-term ADS SRV operations because provision is made l
for an infinite long-term supply through the use of external An allowable leakage criteria ofd73 sec/ min was connections.
esbablished to ensure that there would be sufficient
- ' pneumatic pressure to depressurize the-reactab pressure vessel from the HPCI/RCIC operating prassure.tdr the RHR
\\#
,shytdown cooling operating pressure range.using two ADS SRV actuations over a period of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.
Calculations indicate that this leakage criteria will ensure ADS operability for periods in excess of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> for a range of containment conditions that might accompany the need.for ADS operation.
This duration is sufficient to ensure that the ADS valves can perform their functions.
AM6Jscc./mM-J2.t margin is provided in the allowable leakage rate criteria
' described above to account for any possible increase in.
leakage due to a harsh environment and/or seismic event.
- 1...
. ~1% s,.. margin isio W mea ~ byoveesgete accMahre.
The pneumatic components that make up the ADS accumulator system were designed for low leakage in a harsh environment A safety grade pneumatic supply of er.d seismic event..
nitrogen cylinders is available to provide a backup supply if the ADS accumulator. system leakage rate should exceed its allowable limit.
testing and/or analysis has been As described below, 3.
performed to verify that a harsh environment and/or seismic event would~not increase the leakage rate of the ADS pneumatic supply system.
Rev. 26, 11/83 271.2-2 l
l
)
Cu The pneumatic system solenoid valves have been qualified under the qualification program for electrical equipment to remain functional under conditions simulating the environment following a postulated design basis LOCA.
The pneumatic system spring-loaded, soft-seated valves have been qualified I
to remain.leaktight after a seismic event.
A materials and design review was performed to ensure that the check valves W
ld..not expe.c.ience_a signi
- cant,
.,.n r g p.ou,ti-LDC', environmenGl;ivs1'v'e,'s' iiill'- be f ur't'hef' feivi 9.j,,.
s capabili ty' of :.'tihe'.cNeck
.. Th'o;functilonal
'A
,' ,.pos 1
- .~'
~
.part.of,thg mec.hanical:pquipme,nt. qualification progr.am.,
In
.;...........,anyiev,enti;the.ba.'ckYip.. saf ety,,,qtade~ pneumatic supply 11.11' '
~ ~
provide the motive force'I'or ADS' valve operability.
l i condoc.+t.d 4.
A surveillance test will be +
every refueling cycle l
under the local leak rate test (LLRT) program.
Although the accumulator system is not considered to be a part of the primary containment boundary, this test under the LLRT program ensures completion of the surveillance test.
Two tests will be performed at 90 psig.
For the first test, the isolation boundaries will be~the normal supply check valve, the seismic supply check valve, and the de-energized actuation solenoid.
Vents are provided on the upstream side of the isolation check valves to. meet the. single isolation
' valve-criteria.
For the second test, the solenoid will be
.. s eenergized so that the SRY. actuator and the s'olenoid valve
./
vent port become part of the boundaries.-
In both tests,.the leakage criteria will be 78 sec/ min.
~~ 5.
The backup system is safety-related, seismic Category I, and designed to meet the overall requirements for long-term operation of the ADS system.
6.
The condition of low instrument gas system receiver tank pressure is alarmed in the control room.
The alarm is unspecific with respect to individual ADS accumulators.
When low pressure is sensed in the instrument. gas receiver tank, the station instrument air system can be manually placed into-service as a backup.
Low pressure in the normal instrument gas supply header automatically connects the backup safety-grade instrument gas system to the seismic. Category I ADS -
valve supply header.
The alarms and instrumentation associated with the backup, safety-grade pneumatic supply are described below:
a.
pressure instrumentation is installed in each of the two supply piping brancheu outside containment to provide pressure indication in the control room.
High or low supply pressure in the backup safety-grade gas supply header is alarmed in the control room.
271.2-3
. Rev. 26, 11/83
hk N L
am emsc>,
c
-w p m LGS FSAR Instrumentation is provided to close the ADS valve gas supply containment isolation valves when system pressure b.
' falls to below primary containment pressure.
Indication of valve position for containment isolation w.<.. valves:.and, solenoid valves on the backup ADS gas supply.,
c.
header is provided'iW'the^ control room.-
- ~.
ided.on each backup ADS _
fr.j-[.gf'. 4"d2.i,; 4chal pressure ;iddicatioit. is t prov f
e, 23't9 we.;>:.
- p. ; x,%,.,. :,j,.,, {,
u;^. g.)
.#l
.[.
9s( 80pplyiheaderV M " Sp* we
.....:s.:,:.w:,.;.2,'.
.,.m@def ormed 'by '.use of a.:, J.~.
J,e d..
m..n y ;.
. e:w 7s,j,Testisg..of the backup 'systemSiaasgartsof the. primary-containgtent.leakl
"' ' 9 '* *
~ " surveillancF t'estn Leakage from the remainderof"th'e' "
rate testing program.
system will be monitored daily by operations personnel using a different surveillance test for the seismic bottle supply pressure.
i The alarms and isolation initiation instrumentation associated with the backup nitrogen system will be calibrated 8.
once per operating cycle.
Each ADS accumulator syst'm will be leak rate tested as e
Leakage within.
9..
degeribed in the response to Item 4 above.
the limits discussed in the response to Item 1.above will not t
< prevent the ADS pneumatic supplies _from fulfilling their Oc
. safety function based on analys,is.;.,
- 10. As stated on page 4 of Enclosure i of letter dated March 21, 1983, D.G. Eisenhut, NRC, to T.J. Dente, Chairman, BWR Owners Group, the Technical Specification requirements regarding the ADS will be determined after NRC staff review is completed.
The BWR Standard Technical Specifications (NUREG-0123) currently do not address these points, although the surveillance test requirements contained in the response to Items 4 and 7 ensure that ADS leakage will.be formally monitored.
- 11. The complete ADS accuntlator system and associated equipment:
and control circuitry are included in the Limerick Environmental Qualification Program for electrical and mechanical equipment and will be qualified to accommodate the
~
offects'of, and be compatible with, the environmental L
conditions associated with normal operation, maintenance, testing, and postulated accidents as stated in General Design Criteria 2 and 4 of Appendix A of 10 CFR 50.
e, Figures 5.1-3 and 9.3-2 contain P& ids of the nuclear boiler
- 12. and primary containment instrument gas systems.
G
~
Rev. 26, 11/83 271.2-4
-~
_ - _ _. _ _ -