ML022760129
| ML022760129 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 10/01/2002 |
| From: | Stephen Monarque NRC/NRR/DLPM/LPD2 |
| To: | Christian D Virginia Electric & Power Co (VEPCO) |
| Monarque S, NRR/DLPM, 415-1544 | |
| Shared Package | |
| ML022760006 | List: |
| References | |
| TAC MB4270, TAC MB4271 | |
| Download: ML022760129 (5) | |
Text
QS System 3.6.6 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.6.6.3 Verify each QS automatic valve in the flow 18 months path that is not locked, sealed, or otherwise secured in position, actuates to the correct position on an actual or simulated actuation signal.
SR 3.6.6.4 Verify each QS pump starts automatically on 18 months an actual or simulated actuation signal.
SR 3.6.6.5 Verify each spray nozzle is unobstructed.
Following maintenance which could cause nozzle blockage Amendment Nos.
233 and 215 3.6.6-2 North Anna Units 1 and 2
RS System 3.6.7 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.6.7.4 Verify each RS and casing cooling manuals 31 days power operated, and automatic valve in the flow path that is not locked, sealed, or otherwise secured in position is in the correct position.
SR 3.6.7.5 Verify each RS and casing cooling pump's In accordance developed head at the flow test point is with the greater than or equal to the required Inservice developed head.
Testing Program SR 3.6.7.6 Verify on an actual or simulated actuation 18 months signal(s):
- a. Each RS automatic valve in the flow path that is not locked, sealed, or otherwise secured in position, actuates to the correct position;
- b. Each RS pump starts automatically; and
- c. Each casing cooling pump starts automatically.
SR 3.6.7.7 Verify each spray nozzle is unobstructed.
Following maintenance which could cause nozzle blockage Amendment Nos.
233 and 215 North Anna Units 1 and Z
). U. / -
QS System B 3.6.6 BASES SURVEILLANCE SR 3.6.6.1 (continued)
REQUIREMENTS since they were verified to be in the correct position prior to being secured. This SR does not require any testing or valve manipulation. Rather, it involves verification, through a system walkdown, that those valves outside containment and capable of potentially being mispositioned are in the correct position.
SR 3.6.6.2 Verifying that each QS pump's developed head at the flow test point is greater than or equal to the required developed head ensures that QS pump performance is consistent with the safety analysis assumptions. Flow and differential head are normal tests of centrifugal pump performance required by the ASME Code (Ref.
4). Since the QS System pumps cannot be tested with flow through the spray headers, they are tested on recirculation flow. This test confirms one point on the pump design curve and is indicative of overall performance.
Such inservice tests confirm component OPERABILITY, trend performance, and detect incipient failures by indicating abnormal performance. Tne Frequency of this SR is in accordance with the Inservice Testing Program.
SR 3.6.6.3 and SR 3.6.6.4 These SRs ensure that each QS automatic valve actuates to its correct position and each QS pump starts upon receipt of an actual or simulated Containment Pressure high-high signal.
This Surveillance is not required for valves that are locked, sealed, or otherwise secured in the required position under administrative controls. The 18 month Frequency is based on the need to perform these Surveillances under the conditions that apply during a unit outage and the potential for an unplanned transient if the Surveillances were performed with the reactor at power.
Operating experience has shown that these components usually pass the Surveillances when performed at an 18 month Frequency. Therefore, the Frequency was concluded to be acceptable from a reliability standpoint.
SR 3.6.6.5 With the quench spray inlet valves closed and the spray header drained of any solution, low pressure air or smoke can be blown through test connections or an inspection of the (continued)
Amendment Nos. 233 and 215 North Anna Units 1 and 2 B 3.6.6-5
QS System B 3.6.6 BASES SURVEILLANCE REQUIREMENTS REFERENCES SR 3.6.6.5 (continued) nozzles can be performed. This SR ensures that each spray nozzle is unobstructed and that spray coverage of the containment during an accident is not degraded.
Due to the passive nature of the design of the nozzle and the non-corrosive design of the system, a test performed following maintenance which could result in nozzle blockage is considered adequate to detect obstruction of the nozzles.
- 1. UFSAR, Section 6.2.
- 2.
- 3.
- 4.
ASME Code for Operation and Maintenance of Nuclear Power Plants.
Amendment Nos.
233 and 215 North Anna Units 1 and 2 I
I B 3.6.6-6
RS System B 3.6.7 BASES SURVEILLANCE REQUIREMENTS (continued)
SR 3.6.7.5 Verifying that each RS and casing cooling pump's developed head at the flow test point is greater than or equal to the required developed head ensures that these pumps' performance has not degraded during the cycle. Flow and differential head are normal tests of centrifugal pump performance required by the ASME Code (Ref.
4). Since the RS System pumps cannot be tested with flow through the spray headers, they are tested on recirculation flow. This test confirms one point on the pump design curve and is indicative of overall performance. Such inservice tests confirm component OPERABILITY, trend performance, and detect incipient failures by indicating abnormal performance.
The Frequency of this SR is in accordance with the Inservice Testing Program.
SR 3.6.7.6 These SRs ensure that each automatic valve actuates and that the RS System and casing cooling pumps start upon receipt of an actual or simulated High-High containment pressure signal. Start delay times are also verified for the RS System pumps. This Surveillance is not required for valves that are locked, sealed, or otherwise secured in the required position under administrative controls. The 18 month Frequency is based on the need to perform this Surveillance under the conditions that apply during a unit outage and the potential for an unplanned transient if the Surveillance were performed with the reactor at power. Operating experience has shown that these components usually pass the Surveillance when performed at the 18 month Frequency.
Therefore, the Frequency was considered to be acceptable from a reliability standpoint.
SR 3.6.7.7 This SR ensures that each spray nozzle is unobstructed and that spray coverage of the containment will meet its design bases objective. Either an inspection of the nozzles or an air or smoke test is performed through each spray header. Due to the passive design of the spray header and its normally dry state, a test performed following maintenance which could result in nozzle blockage is considered adequate for detecting obstruction of the nozzles.
REFERENCES
- 1. UFSAR, Section 6.2.
Amendment Nos.
233 and 215 North Anna Units 1 and 2 I
B 3.6.7-8