ML20114F806
| ML20114F806 | |
| Person / Time | |
|---|---|
| Site: | 05000000 |
| Issue date: | 06/04/1982 |
| From: | Hebdon F NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Logan B DUKE POWER CO. |
| Shared Package | |
| ML19255H970 | List: |
| References | |
| FOIA-84-44 NUDOCS 8206220012 | |
| Download: ML20114F806 (3) | |
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Central File AE00 Reading File AE0D Chron File JUN 4 1982 F. Hebdon, PTB C. J. Heltemes, AE00 C. Michelson, AE00 Mr. Bruce Logan Duke Power Company P.O. Box 33189 Charlotte, NC 28242
Dear Bruce:
As requested by your letter dated April 19, 1982, we have reviewed the descriptions and generic drawings for Pressurized Water Reactore (PWR) designs.
In general, we find the descriptions and generic drawings to be a commendable product of great potentiai value. We did, however, note that the descriptions and drawings need to be more carefully reviewed to reduce inconsistencies between the descriptions and the associated drawings, and between the drawings of comparable systems in different designs. For example, the list of reportable components for the Reactor Coolant System in the Westinghouse design includes the pressurizer heaters; while the lists of reportable components for the Reactor Coolant System in the CE and B&W designs do not. As another example, the list of reportable components for the Low Pressure Safety Injection System (CFR) does not include tanks, pumps, or coolers; although tanks, pumps, and coolers are all shown on the drawing for the system.
In addition, we are very concerned that Chilled Water Systems,and the associated HVAC systems, that cool rooms that contain essential components are not included in the reportable scope of NPRDS.
In addition, ccrnpressed air systems that are essential for the control or operation of essential components should be included.
Support systems that are required for the operation of essential conponents must be included.
Some additional specific comments are enclosed.
Please call me
[(301)492-4489] if you have any quest. ions concerning our comments.
Sincerely,
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Frederick J. Hebdon, Chief Program Developnent Section Office f_or Analysis and Evaluation of Operational Data st e v'2.M (A '5f,
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'b Specific Comments on the NPRDS Recortaole Systems and Component Scope Manual 1.
The standard set of component symbols should include a symbol for a damper.
Dampers are shown on some HVAC drawings (e.g., Reactor Building Cooling (SBB)).
2.
The descriptions of comparable systems (e.g., Low Pressure Safety Injection Systems) for different designs should be consistent.
3.
The definition of boundaries between power supply breakers, and their associated control and protective circuits needs to.be better defined. For example, the drawing for the Reactor Coolant System (CBD) shows the circuit breakers, but the list of reportable components states that circuit breakers are in the control circuit.
4.
The lists of reportable components for similar systems should be reviewed and made consistent. For example, the Reactor Coolant System (CBH) for.the Westinghouse design includes the pressurizer heaters, but the drawings for the CE and B&W designs do not.
In addition, for the Reactor Coolant System, the reactor vessel, switches, and relays were not treated consistently.
5.
The drawings and the lists of reportable comptnents should also be checked for consistency. For example, the list of reportable components for the Low Pressure Safety Injection System (CFD) does not include tanks, punps, or coolers; however, tanks, pumps, and coolers are all shown on the drawing.
6.
The pressurizer heaters and associated circuit breakers should be included in the Reactor Coolant System.
7.
Minimum flow lines and test return lines shco'd be included in appropriate drawings.
8.
The Main Steam System (HBA) uses a symbol for the Main Steam Isolation Valves that is not defined in the set of standard component symbols.
Also, the main steam lines should be shown going to a common header before entering the turbine.
9.
The list of reportable components for control circuits should include switches (e.g., the Integrated Control Circuit System (IEG)).
- 10. The system description for the Service Water System (WAB) should not state that service water normally comes from a service water pond.
This is an exception rather than the rule.
- 11. A distinction should be made between essential and nonessential component cooling water systems. Essential component cooling water systems should be shown as having redundant trains (e.g., WBB shows a single train).
- 12. The Main Steam Isolation Valves for CE plants' (HBB) re shown to be motor operated. We do not believe that this is correct.
emes
13.
The High Pressure Safety Injection System in Westinghouse designs should include the Upper Head Injection System.
14 The following valves should be added to the appropriate drawings; RHR sumo valves, secondary relief and safety valves, turbine stop and governor valves, steam admission valves and piping for the turbine driven AFW pump, and charging flow control valves.
- 15. The High Pressure Core Spray should not be included in the EDA system title.
16.
In-core components should be included in the Reactor Coolant System or as part of a separate system.
- 17. The list of reportable components for the Emergency Power System does not appear to include all appropri, ate components (e.g., logic devices associated with sequencing).
18.
The list of reportable components for the Reactor Building Spray System should include chemical tanks and heaters.
19.
The Combustible Gas Control System, Dilution Type Subsystem (SECDIL) should be described and a list of reportable components provided.
In addition, a pump or blower is required to add air to the s;bsystem after an accident.
20.
The description of the Core Flood System should mention that for large LOCAs the system will not keep the core covered but does provide a reflood volume.
21.
The description of the service water system shoule cention that it provides the ultimate heat sink for safety related loads.
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