ML19255K396
| ML19255K396 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/28/1980 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML111090060 | List:
|
| References | |
| FOIA-80-515, FOIA-80-555, RTR-NUREG-0578, RTR-NUREG-578 NUDOCS 8004100844 | |
| Download: ML19255K396 (2) | |
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TMI-I RESTART SER SUPPLEMENT 2.1.7.b Auxiliary Feedwater Flow Indication to Steam Generators for PWR's In the Status Report, we stated that the existing steam generator level indi-cators for TMI-I are safety grade and provided additional diverse means of monitoring emergency feedwater flow. We have since learned that this statement was in error in that the level indicators are not safety grade. Although the existing steam generator level instrumentation has been seismically and environ-mentally qualified and does receive power from onsite lE power sources, the level signals are processed through the Integrated Control System (ICS) which is not capable of meeting the single failure criterion. The power diversity require-ment for EFW flow measurement is satisfied by use of the vital 120 V power system which is backed up by the Class lE batteries.
In the Status Report, we indicated that we will require that the TMI-I Technical Specificatio1 be revised to include that a channel functional test be performed for each flow instrument redundant channel at the same frequency that EFW pump surveillance testing is performed.
In Amendment 12, the licensee submitted revised technical specifications which included this requirement. We, therefore, conclude that the licensee meets the require-ment for testability of EFW flow instrumentation.
In the Status Report, we required additional information on the environmental qualification of the EFW flow measuring devices.
In Amendment 13, the licensee provided a more detailed description of the flow monitoring devices and the specific qualification for each component. Each flow device consists of a loop 8004100 y
. containing a ficw transducer, flow display computer (flow trar.smitter) and control room mounted indicator. The transducers aie installed in the Inter-mediate Building on the EFW lines downstream of the control valves before the lines enter containment. They have been qualified for continuous operation in 250 F ambient or process line conditions following a half hour exposure to 350 F ambient or process line condition. This qualification provides assurance that the transducers can withstand the resulting environment from a postulated steam line break in the Intermediate Building, and will remain functional ~. The licensee has indicated that the flow display computers will be installed in their respective (Train A or 8) diesel generator building or a comparable environ-U mentally suitable area for their qualificatien of -20 to 110 F ambient condition.
The coaxial cable between each transducer and its corresponding computer meets the requirements for Class lE application as addressed in IEEE-383-1974. We conclude that the licensee has satisfied our' concern with environmental qualifi-cation of the EFW flow devices. The licensee has agreed to supply vendor certification for the qualification previously described.
Based on the licensee's revised submittal and agreement to supply vendor certification, we conclude ; hat the licensee is in compliance with the require-ments of NUREG-0578, item 2.l.7.b for providing safety-grade emergency feedwater flow indication in the control room.