ML20207P551
| ML20207P551 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 01/13/1987 |
| From: | LOUISIANA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20207P548 | List: |
| References | |
| NUDOCS 8701160236 | |
| Download: ML20207P551 (4) | |
Text
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i NPF-38-52 C
ATTACHMENT A 8701160236 870113 PDR ADOCK 05000382 P
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INSTRUMENTATION CHEMICAL DETECTION SYSTEMS BROAD RANGE GAS DETECTION LIMITING CONDITION FOR OPERATION 3.3.3.7.3 Two independent broad range gas detection systems shall be operable with their alare/ trip setpoints adjusted to actuate at the lowest achievable IDLH gas concentration level of detectable toxic gases providing reliable operation.
APPLICABILITY: All MODES.
ACTION:
- a. With one broad range gas detection system inoperable, restore the inoperable detection system to OPERABLE status within 7 days or within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> initiate and maintain operation of the control room ventilation system in the-recirculation mode of operation,
- b. With no broad range gas detection system OPERABLE, within I hour initiate and maintain operation of the control room ventilation system in the recirculation mode of operation.
- c. The provisions of Specification 3.0.4 are not applicable.
SURVEILLANCE REQUIREMENTS
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4.3.3.7.3 Each broad range gas detection system shall be demonstrated OPERABLE by performance of a CHANNEL CHECK at least once per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, a CHANNEL FUNCTIONAL-TEST at least once per 31 days and a channel calibration at least once per 7 days. Calibration will consist of the introduction of a standard gas and adjusting the instrument sensitivity based on the calibra-tion gas relationship of the standard gas to the calibrating gas.
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NPF-38-52 ATTACHMENT B
INSTRUMENTATION BASES
-3/4.3.3.7 Chemical Detection Systems The chemical detection systems are the ammonia, chlorine, and broad range toxic gas detection systems.
The OPERABILITY of the chemical detection systems ensures that sufficient capability is available to promptly detect and initiate protective action in-the event of an accidental chemical release.
The chemical detection systems provide prompt detection of toxic gas releases which could pose an actual threat to safety of the nuclear power plant or significantly hamper site personnel in performance of duties necessary for the safe operation of the plant.
The broad range toxic gas detection system operates on the principle of gas photoionization, and therefore, the system is sensitive to a broad range of gases. The system is therefore sensitive to both atmospheric and chemical composition normal fluctuations affecting the Waterford 3 site. The setpoint for the system is thus based on testing and operating experience, and the setpoint is set at the lowest achievable IDLH gas concentration providing reliable operation and the optimum detection of toxic gases. The setpoint is therefore subject to change wherein necessitated by operating experience such as a result of change = in the Waterford 3 area chemical atmospheric profile.
The setpoint is establ*shed and controlled by procedure.