ML022470205
| ML022470205 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 08/29/2002 |
| From: | NRC/NRR/DLPM |
| To: | |
| References | |
| TAC MB5198, TAC MB5199 | |
| Download: ML022470205 (3) | |
Text
AC Sources - Operating 3.8.1 SURVEILLANCE REQUIREMENTS (continued)
SURVEILLANCE SR 3.8.1.5 NOTE ----------------------------
This surveillance shall not normally be performed with the associated unit in MODE 1, 2, 3, or 4.
However, portions of the Surveillance may be performed to reestablish OPERABILITY provided an assessment determines the safety of the plant is maintained or enhanced.
Verify on an actual or simulated loss of offsite power signal in conjunction with an actual or simulated ESF actuation signal:
- a.
De-energization of emergency buses;
- b.
Load shedding from emergency buses; and
- c.
Standby emergency power source auto-starts from standby condition and:
- 1.
energizes permanently connected
- loads,
- 2.
energizes auto-connected emergency loads through load logic and sequencer,
- 3.
achieves steady state voltage within
- limits,
- 4.
achieves steady state frequency within limits, and
- 5.
supplies permanently connected and auto-connected emergency loads for
> 5 minutes.
Point Beach 3.8.1-7 Unit 1 - Amendment No. 201, 204 Unit 2 - Amendment No. 2e6, 209 FREQUENCY 18 months (continued)
I i
AC Sources - Operating B 3.8.1 BASES SURVEILLANCE REQUIREMENTS (continued)
The requirement to verify the connection and power supply of permanent and autoconnected loads is intended to satisfactorily show the relationship of these loads to the standby emergency power source loading logic. In certain circumstances, many of these loads cannot actually be connected or loaded without undue hardship or potential for undesired operation. For instance, Emergency Core Cooling Systems (ECCS) injection valves are not desired to be stroked open, or high pressure injection systems are not capable of being operated at full flow, or residual heat removal (RHR) systems performing a decay heat removal function are not desired to be realigned to the ECCS mode of operation. In lieu of actual demonstration of connection and loading of loads, testing that adequately shows the capability of the standby emergency power source systems to perform these functions is acceptable. This testing may include any series of sequential, overlapping, or total steps so that the entire connection and loading sequence is verified.
The Frequency of 18 months is consistent with the recommendations of Regulatory Guide 1.9 (Ref. 4), takes into consideration unit conditions required to perform the Surveillance, and is intended to be consistent with standard fuel cycle lengths.
For the purpose of this testing, the standby emergency power sources must be started from standby conditions. That is, with the engine oil continuously circulated and engine temperature maintained consistent with manufacturer recommendations for standby emergency power sources.
This SR is modified by a note. The reason for the Note is that the performance of the Surveillance would remove a required offsite source from service, perturb the electrical distribution system and challenge safety systems.
This restriction from normally performing the Surveillance in MODE 1, 2, 3 or 4 is further amplified to allow portions of the Surveillance to be performed for the purpose of reestablishing OPERABILITY (e.g., post work testing following corrective maintenance, corrective modification, deficient or incomplete surveillance testing, and other unanticipated OPERABILITY concerns) provided an assessment determines plant safety is maintained or enhanced. This assessment shall, as a minimum, consider the potential outcomes and transients associated with a failed partial Surveillance, a successful partial Surveillance, and a perturbation of the offsite or onsite system when they are tied together or operated independently for the partial Surveillance; as well as the operator procedures available to cope with these outcomes.
These shall be measured against the avoided risk of a plant shutdown Point Beach B 3.8.1-21 Unit 1 - Amendment No. 204 Unit 2 - Amendment No. 209
AC Sources - Operating B 3.8.1 BASES SURVEILLANCE REQUIREMENTS (continued)
REFERENCES and startup to determine that plant safety is maintained or enhanced when portions of the Surveillance are performed in MODE 1, 2, 3 or 4.
Risk insights or deterministic methods may be used for this assessment.
SR 3.8.1.6 As required by Regulatory Guide 1.9 (Ref. 4), this Surveillance ensures that the manual synchronization and load transfer from the standby emergency power source to the offsite source can be made and the standby emergency power source can be returned to ready to load status when offsite power is restored. It also ensures that the autostart logic is reset to allow the standby emergency power source to reload if a subsequent loss of offsite power occurs. The standby emergency power source is considered to be in ready to load status when the standby emergency power source is at rated speed and voltage, the output breaker is open and can receive an autoclose signal on bus undervoltage, and the load sequence timers are reset.
The Frequency of 18 months is consistent with the recommendations of Regulatory Guide 1.9 (Ref. 4), and takes into consideration unit conditions required to perform the Surveillance.
- 1. FSAR. Section 1.3.
- 2. FSAR. Chapter 8.
- 3. FSAR. Chapter 14.
- 4. Regulatory Guide 1.9, Rev. 3, July 1993.
- 5. Regulatory Guide 1.93, Rev. 0, December 1974.
- 6. Generic Letter 84-15, "Proposed Staff Actions to Improve and Maintain Diesel Generator Reliability," July 2, 1984.
Point Beach B 3.8.1-22 Unit 1 - Amendment No. 204 Unit 2 - Amendment No. 209