ML051680102

Tech Spec Pages Re Allowed Outage Times for Accident Monitoring Instrumentation

ML051680102
Person / Time
Site:	Seabrook
Issue date:	06/15/2005
From:	NRC/NRR/DLPM
To:
References
TAC MC4902
Download: ML051680102 (5)

Text

INSTRUMENTATION MONITORING INSTRUMENTATION ACCIDENT MONITORING INSTRUMENTATION LIMITING CONDITION FOR OPERATION 3.3.3.6 The accident monitoring instrumentation channels shown in Table 3.3-10 shall be OPERABLE.

APPLICABILITY: MODES 1, 2, and 3.

.......................................................... N O E................................ OT..............

A separate ACTION entry is allowed for each INSTRUMENT listed in Table 3.3-10.

ACTION:

a. With the number of OPERABLE accident monitoring instrumentation channels less than the Total Number of Channels shown in Table 3.3-10, restore the inoperable channel(s) to OPERABLE status within 30 days, or submit a Special Report to the Commission pursuant to Specification 6.8.2 within the next 14 days outlining the preplanned alternate method of monitoring, the cause of the inoperability, and the plans and schedule for restouing the instrumentation to OPERABLE status.

b. With the number of OPERABLE accident monitoring instrumentation channels except the containment POST-LOCA high range area monitor, less than the Minimum Channels OPERABLE requirements of Table 3.3-10, restore the inoperable channel(s) to OPERABLE status within 7 days or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in at least HOT SHUTDOWN within the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. The provisions of Specification 3.0.4 are not applicable.

c. With the number of OPERABLE channels for the containment Post-LOCA high range area monitor less than required by the Minimum Channels OPERABLE requirements, initiate an alternate method of monitoring the appropriate parameter(s), within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, and either restore the inoperable channel(s) to OPERABLE status within 7 days or prepare and submit a Special Report to the Commission, pursuant to Specification 6.8.2, within 14 days that provides actions taken, cause of the 1noperability, and the plans and schedule for restoring the channels to OPERABLE status.

SEABROOK - UNIT I 314 3-49 Amendment No. 34, 103

SURVEILLANCE REQUIREMENTS 4.3.3.6 Each accident monitoring instrumentation channel shall be demonstrated OPERABLE:

a. Every 31 days by performance of a CHANNEL CHECK, and

b. Every 18 months by performance of a CHANNEL CALIBRATION.

SEABROOK - UNIT I 3/4 349a Amendment No. l 103

INSTRUMENTATION BASES MONITORING INSTRUMENTATION 314.3.3.5 REMOTE SHUTDOWN SYSTEM (Continued)

The OPERABILITY of the Remote Shutdown System ensures that a fire will not preclude achieving safe shutdown. The Remote Shutdown System instrumentation, control, and power circuits and transfer switches necessary to eliminate effects of the fire and allow operation of instrumentation, control and power circuits required to achieve and maintain a safe shutdown condition are independent of areas where a fire could damage systems normally used to shut down the reactor. This capability is consistent with General Design Criterion 3 and Appendix R to 10CFRPart 50.

314.3.3.6 ACCIDENT MONITORING INSTRUMENTATION BACKGROUND The OPERABILITY of the accident monitoring instrumentation ensures that sufficient information is available on selected plant parameters to monitor and assess these variables following an accident. This capability is consistent with the recommendations of Regulatory Guide 1.97, Revision 3, "Instrumentation for Light-Water-Cooled Nuclear Power Plants to Assess Plant Conditions During and Following an Accident," May 1983 and NUREG-0737, "Clarification of TMI Action Plan Requirements," November 1980.

LCO The purpose of the post-accident monitoring (PAM) instrumentation required by this Technical Specification (TS) Is to enable the operator to monitor safety functions, take any manual actions required to support the accomplishment of safety functions, and determine the effect of manual actions during and following a design basis accident. The instrumentation also enables the operator to maintain the plant in a hot shutdown condition, orto proceed to cold shutdown.

The Instrument channels required to be operable by this LCO include two classes of parameters identified during implementation of Regulatory Guide 1.97: Type A variables and Category I key variables. Type A variables are those that provide primary information for the control room operators to take specific preplanned manual actions for which no automatic control is provided. These actions are required for safety systems to accomplish their safety functions for design basis accident events. (Actions taken as a result of equipment failures, e.g., "Response Not Obtained" column in the Emergency Operating Procedures (EOPs), are excluded). Key variables are those variables that provide the primary information (essential for the direct accomplishment of the specified safety functions) required to permit the control room operating crew to:

SEABROOK - UNIT I B 314 3-5 BGR No.0 D02, Amendment No. 103 Revised b' NRC lcttr dated-6/8--

-INSTRUMENTATION BASES 314.3.3.6 ACCIDENT MONITORING INSTRUMENTATION (Continued)

-CO (Continued)

a. Perform the diagnosis specified in the EOPs for design basis accidents.

b. Take any manual action required to mitigate the consequences of an accident.

c. Monitor the operation of safety systems.

The PAM instruments controlled by this TS are identified with an orange nameplate containing black lettering. PAM instruments, such as dedicated recorders and plasma displays are provided where direct and Immediate trend or transient information is essential for operator information or action. An operable PAM recorder must be capable of measuring, displaying (plasma display), and recording (chart recorder) the parameters trend information.

ACTION:

.......................................................... NOTE....................................

This note clarifies the application of the AOT for multiple, inoperable instruments. The actions of this specification may be entered independently for each item listed under the heading INSTRUMENT in Table 3.3-10. The AOT of the inoperable channels will be tracked separately for each instrument starting at the time the action was entered for that instrument.

a. Action a. applies when an Instrument has one or more inoperable channels but the minimum channels operable requirement is met. The 30-day allowed outage time (AOT) takes into account the remaining operable channels, the passive nature of the instruments (no critical automatic action Is assumed to occur from these instruments), and the low probability of an event requiring PAM instrumentation during this interval.

Ifthe inoperable channels are not restored within 30 days, the action requires submittal of a written report to the NRC within the next 14 days. The report discusses the cause of the inoperability, alternative actions, and the plans and schedule for restorative actions. Submitting a report in lieu of a plant shut down is appropriate since the report identifies a preplanned method of monitoring and the likelihood of plant conditions that would require information provided by this instrumentation is low.

SEABROOK - UNIT I B 3/4 3-6 Amendment ND.103

INSTRUMENTATION BASES 314.3.3.6 ACCIDENT MONITORING INSTRUMENTATION (Continued)

ACTION:

b. Action b. applies when an instrument has less than the required minimum number of operable channels. The 7-day AOT is based on the relatively low probability of an event requiring PAM instrumentation and the availability of alternate means (non-Regulatory Guide 1.97 instruments) to monitor the parameter. Continuous operation with less than the minimum required channels is not acceptable because alternate indication may not fully meet the performance qualifications applied to PAM instrumentation.

c. Action c. applies to the containment post-LOCA high range area radiation monitor when less than the minimum required channels are operable.

Seventy-two hours is permitted to initiate the alternate method of monitoring for the post-LOCA monitor. Ifthe monitor is not restored to operable status within the 7-day AOT, a report that discusses the actions taken, the cause of the inoperability, and the plans and schedule for restoring the instruments to operable status must be submitted to the NRC within 14 days.

314.3.3.7 (THIS SPECIFICATION NUMBER IS NOT USED) 314.3.3.8 (THIS SPECIFICATION NUMBER IS NOT USED) 314.3.3.9 (THIS SPECIFICATION NUMBER IS NOT USED) 3/4.3.3.10 EXPLOSIVE GAS MONITORING INSTRUMENTATION The explosive gas instrumentation Is provided to monitor and control, the concentrations of potentially explosive gas mixtures in the WASTE GAS HOLDUP SYSTEM. The OPERABILITY and use of this Instrumentation is consistent with the requirements of General Design Criteria 60, 63, and 64 of Appendix A to 10 CFR Part 50.

314.3.4 (THIS SPECIFICATION NUMBER IS NOT USED)

SEABROOK - UNIT I B 3/4 3-7 Amendment No. l 103