ML19337B461
| ML19337B461 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 09/30/1980 |
| From: | PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| Shared Package | |
| ML19337B459 | List: |
| References | |
| NUDOCS 8010020493 | |
| Download: ML19337B461 (7) | |
Text
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G' PBAPS LIMITING C 0 !! D I T I 0 t! S FOR OPERATI0t:
SURVElLLANCE REQUll EMET;TS 3.1 REACTOR PROTECTION S Y S T E !!
4.1 REACTOR PROTECTION SYSTEtt Appiicability:
Applicabi1ity:
Applies to the instrumentation and Applies to the surveillonce associated devices which initiate of the instrumentation and a reactor scran.
associated devices which initiate reactor ser.u.
Objective Objective To assure the operability To specify the type and of the reactor protection frequency of surveillance system.
to be applied to the protection instrumentation.
Specification:
Specification:
A.
Ilhen there is fuel in the vessel A.
Instruuentation systems the setpoint, ninimun number shall be functionally of trip systems, and minimum tested and calibrated number of instrument channels as indicated in Tables that must be operable for 4.1.1 and 4.1.2 each position of the reactor respectively.
n o ti c switch shall be as given in Table 3.1.1.
3.
The d e s i r;n e d systen response D.
Daily, during reactor power times trou the openinn of the operation, the maxinum fraction' sensor contact up to and of limiting power density includir3 the opening of the shall be checked and the trip actuntor contacts shall scran and APRM rod block not exceed 50 milliseconds.
settings given by equations Otherwise, the affected trip in Specification 2.1.A.1 synten shall be placed in and 2.1.n shall he calcu-the tripped condition, or lated if the maxinun j
the action listed in Table fraction of the limiting 3.1.1 for the specific trip power density exceeds the
)
function shall be taken.
fraction of rated power.
l E010oga
PBAPS UNIT 2 TABLE 3.5-2 OPERATING LIMIT MCPR VALUES AS DETERMINED FOR VARIOUS CORE EXPOSURES i
MCPR Operating Limit Fuel Type For IncrementL1 Cycle 5 Core Average Exposure BOC to 1000 MWD /t 1000 MWD /t Before EOC Before EOC to EOC 8X8 1.28 1.28 8X8R & LTA 1.28 1.28 P8X8R 1.30 1.30
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- . o ATTACHMENT A
SUBJECT:
Reactor Protection System (RPS) Delay Time Change Basis On 3/21/80, Philadelphia Electric Company was notified by General Electric Company that a discrepancy was discovered between the safety analysis value (50 milliseconds) for RPS delay time and the Technical Specification Limiting Condition of Operation RPS value (100 millis~econds).
In light of Technical Specification 2.1 (paragraph 3), the RPS scram circuit delay for safety analysis purposes is conservatively set equal to the longest delay acceptable by the Technical Specifications which would be the Limiting Condition of Operation RPS 100 millisecond value.
In reality, both the Peach Bottom 2 Reload 4 (NEDO-24237) and Peach Bottom 3 Reload 3 (NEDO-24204A) safety analysis were performed using a 50 millisecond RPS scram delay value.
The basis for our acceptance of 50 milliseconds as the safety analysis and proposed Technical Specification Limiting Condition of Operation RPS value is founded on the following:
1.
Reactor Protection System (RPS) Desion Specification (Re: Letter, G.
R.
Hull to R.
H.
Logue, " Reactor Protection System (RPS) Delay Time", dated 5/21/80).
The value of 50 milliseconds is the time for RPS delay specified in the GE RPS Design Specification.
The General Electric Company analytical group, which performs transient analyses, assumes that the RPS response characteristics would meet the limits specified in the RPS design specification.
The fact that the Technical Specification specify a value of 100 milliseconds is an oversight.
f 2.
Reactor Protection System (RPS) Response Time - Actual (Re:
Letter W.
T.
Ullrich to W.
M.
Alden, " Reactor Frotection System (RPS) Response Time", dated 6/29/80).
When the subject RPS delay time discrepancy was discovered, Peach Bottom began an investigation into the MPS response time tests and methods to ensure that the 30 millisecond value was and could be complied with.
The results of that investigation demonstrated that all subject RPS instrument response times are, and have been, significantly less than 50 milliseconds and that Peach Bottom consequently could comply with a 50 millisecond RPS delay time value.
The above referenced information is available for inspection at Peach Bottom.
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