ML20078C810
| ML20078C810 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 10/25/1994 |
| From: | PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| Shared Package | |
| ML20078C809 | List: |
| References | |
| NUDOCS 9411010351 | |
| Download: ML20078C810 (4) | |
Text
_
Unit 2 PBAPS SURVEILLANCE REQUIREMENTS 2,IMITING CONDITIONS FOR OPERATION 4.5.C HPCI Subsystem (cont'd.)
3.5.C HPCI Subsystem (cont'd.)
Frequenc'y Item (b) Pump Once/ month Operability i
(c) Motor Operated Once/ month Valve Ve r'. [L de yh cen t br pre 55M'
\\
Operability bo (d) Flow Rate at once/3 months can The flPC L pu m fg 4-ng ps ; '].
approximately l
1030 psig
[lov.; FMc 2 5000 grrn Reactor Steam dege lqa a
-S y sf e.w he(d Pressure ct du; n cL (
+
e it once/oper.m ing C orrmpo.,dc n} h reocbe / c Gac f(e) cycle l
r--,
P :cter Stc;.
Pr;;2=0 ii The HPCI pump shall deliver at least 5000 gpm for a system head corresponding to a reactor pressure of approximately 1030 to l
150 psig.
- 2. DELETED
- 2. From and after the date that the HPCI Subsystem is made or
'found to be inoperable for continued reactor any reason, operation is permissible only during the succeeding seven days unless such subsystem is sooner made operable, provi-ding _that during such seven days all active components of the ADS subsystem, the RCIC system, the LPCI subsystem and both core spray subsys-tems are operable.
- 3. If the requirements of 3.5.C cannot be met-i an orderly shut-d:wn shall be initiated and the reactor shall be in a Cold Shutdown Condition a,[h rea lor Shm within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
c l 2, hovF,,
05 r e j v. rf d 40 be perhmed mhladqv A 4n gedu m +he 4 c
. Pre 3sm e a,e ft % gre r
-129-
- nt !BasM!8)];7 P
Uni?. 2 PBAPS f'
4.5 BASES Core and Containpent Cooline Systems Surveillance Frecuencies The perfomance of individual emergency core cooling systems (HPCI, LPCI, Core Spray and ADS) and the integrated perfomance of the emergency core cdoling systems are described in analyses referenced in Section 6.5 of the Updated Final Safety Analysis Report. Periodic surveillance of pumps and valves is perfomed in accordance with ASME wserar Code,.Section XI, to the extent described in *.he Inservice Testing i
Plan, to verify that the systems will provide the flow rates r by the respective analyses. HPCI and RCIC flow tests r omed at' two pressures n that the systems' capabilit provide rated flow over their operating range is verified.
o avoid damaging Core Spray system valves'during Core Spray pump flow testing, throttling is not normally perfomed to obtain a system head corresponding to a reactor pressure of 2 105 psig. Pump curves are used to determine equivalent values for flow rate and test pressure for the Core Spray pumps in order to meet the' Surveillance Requirements. HPSV flow -
tests verify that rated flow can be delivered to the RHR heat exchangers.
The testing interval for the core and containment cooling systems is
^
based on industry practice, sound engineering judgment and practicality. The core cooling systems have not been designed to be fully testable during operation. For example, in tha case of the HPCI, automatic initiation during power operation wouki result in pumping cold water into the reactor vessel which is not desirable.
Complete ADS testing.during power operation caures an undesirable loss-of-coolant inventory. To increase the availability of the core and containment cooling systems, the components which make up the' system; i.e., instrumentation, pumps, valves, etc., are tested frequently. The pumps and motor operated injection valves are also tested each month to assure their operability. A simulated automatic actuation test once each cycle combined with frequent tests of the pumps and injection valves is deemed to be adequate testing of these systems.
I The flow path piping of the emergency core cooling systems-(ECCS) has t'he potential to develop voids and pockets of entrained air.
Maintaining the pump discharge lines of the HPCI system, Core Spray system, and LPCI subtystems full of water ensures that the ECCS will perform properly injecting its full capacity into the reactor pressure vessel upon demand. This will also prevent a water hamer following an ECCS initiation sionah one acceptable method of 1
ensuring-that the lines are full is to vent at the high points. An acceptable method of ensuring the LPCI and Core Spray system discharge lines are full is to verify the absence of the associated
" keep fill" system accumulator alarms.
While the reactor is in the Cold Condition one low pressure ECCS subsystem can maintain adequate reactor vessel water level. To provide redundancy, a minimum of two low pressure ECCS subsystems are required to be OPERABLE with the reactor in the Cold Condition.
t SEP 161954
-141-Amendment No. If0. 195 sI*d-110'oN 61:ST L6.91 du C O I M'i-T M ; E M MM
Unit 3*
P8'd' S P
', i LIKIT]NG CONDITIONS FOR OPERATION SilRVEILLANCE REQUIREMENTS 3.5 C HPCJ Subsystem (cont'd.)
4.5.C HPCI Subsystem (cont'd.)
Item Frecuency (b) Pump Once/montn Operability
\\/er. fg c.o,% rea to preasum 6 iM PW3 (c) Hotor Operated Once/ month raie Valve pump Can deuctop n Aow Operability
-the H FC(
3 2 Soc >o 3pm a<j& s t t% Cp t em head t
corre >(5on Uin] h ~rra che^r fre s t:'
(d) e at Once/3 months e
Steam Pressure (e) Floa Rate-+t-Once/ opera-150 psig-ting Cycle Ste - "rc::urc The HPCI pump shall deliver at least 5000 gpm for a system head corresponding to a reactor pressure of 1000 to 150 r-ig.
2.
From and after the date that
- 2. DELETED the HPCI Subsystem is made or found to be inoperable for any reason, continued reactor operation is permissible only l' m durir.g the succeeding seven
'~
days unless such subsystem is sooner made operable, provi-ding that during such seven days all active components of
/
the ADS subsystem, the RCIC system, tne LPCI subsystem and both core spray-subsys-tems are operable.
3.
If the requirements of 3.5.C cannot-te' met,.an orderly shut-down shall be initiated and the reactor shall be in a Cold Shutdown Condition within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
aErer reac W 4 Fl c t reqv. red f c, be 9e r (6,m eel unh \\ a mucS
,gg 4e g,
and 6c" a'e " d *'i '"
?,, 7,, m s + ect. m gre sve 1
.s Amendment tio. 162
-129-t JUN 121931
Y'"'
Unit 3 PBAPS (n
a 4.5 BASES Core and Containment Coolina Systems _ Surveillance Frecuencies The performance of individual emergency core cooling systems (HPCI, 1
LPCI,. Core Spray and ADS) and the integrated performance of the emergency core cooling systems are described in analyses referenced.
in Section 6.5 of the Updated Final Safety Analysis Report. Periodic surveillance of pumpt r.d valves is perfomed in accordance with ASME W1zer Code,Section XI, to the extent described in the Inservice Tes 7 g
Plan, to verify that the systems will provide the flow ra.tse-fequired by the respective analyses. HPCI and RCIC flow tes re performed at two pressures so that the systems' capabili o provide rated s
flow over their operating range is verified. To avoid damaging Core Spray system valves during Core Spray pump flow testing, throttling is not normally performed to obtain a system head correspondits to a reactor pressure of 2 105 psig. Pump curves are used to determine equivalent values for flow rate and test pressure for the Core Spray pumps in order to meet the Surveillance Requirements. HPSW flow tests verify that rated flow can be delivered to the RHR heat exchangers.
The testing interval for the core and containment cooling systems is based on industry practice, sound engineering judgment and practicality. The core cooling systems have not been designed to be fully testable during operation. For example, in the case of the HPCI, automatic initiation during power operation would result in pumping cold water into the reactor vessel which is not desirable.
i
"~
Complete ADS testing during power operation causes an undesirable loss-of-coolant inventory. To increase the availability of the core i
and containment cooling systems, the components which make up the system; i.e., instrumentation, pumps, valves, etc., are tested j
frequently. The pumps and motor operated injection valves are also tested each month to assure their operability. A simulated automatic actuation test once each cycle combined with frequent tests of the pumps and injection valves is deemed to be adequate testing of these systems.-
'The flow path piping of the emergency core cooling systems (ECCS) has
)
the potential to develop voids and pockets of entrained air.
Maintaining the pump discharge lines of the HPCI system, Core Spray system,,and LPCI subsystems full of water. ensures that the ECCS will perform properly, injecting its full capacity into the reactor pressure vessel upon demand. This will also prevent-a water hammer followinsf an ECCS initiation signal. One acceptable method of ensuring that the lines are full is to vent at the high points. An accestable method of ensuririg the LPCI and Core Spray system j
discsarge lines are full is to verify the absence of the associated
- keep fill" system accumulator alarms.
j While the reactor is in the Cold Condition one low pressure ECCS subsystem can maintain adequate reactor vessel water level. To y'
provide redundancy, a minimum of two low pressure ECCS subsystems are required to be OPERABLE with the reactor in the Cold Condition.
8EP 1g as4
-141-Amendment No. If, I62.199 en..,.,,s.~,
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n, n.
-nc. w.,.
2n~ ~ ve n
,m
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