ML19347D955
| ML19347D955 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 04/03/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NCR-EEB-8009-15, NCR-EEB-8019, NUDOCS 8104140522 | |
| Download: ML19347D955 (7) | |
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400 Chestnut Street Tower II April 3, 1981 Mr. Jame gP. O'Reilly, Director Office of Inspection and Enforcement U.S. Nucles' Regulatory Commission Region II -
ite 3100 101 Marietta treet Atlanta, Georg 30303 Dear Mr. O'Re111 -
SEQUOYAH NUCLEAR PLANT UNIT 2 - ENVIRONMENTAL QUALIFICATION OF CLASS IE EQUIPMENT - NOR'S SQN EEB 8009 THROUGH 8015 AND 8019 - FINAL REPORT The subject deficiency was initially reported to NRC-0IE Inspector C. R. McFarland on June 16, 1980, in accordance with 10 CFR 50.55(e).
Interim mports were submitted on July 16, August 11, September 19, and November 21, 1980, and February 25, 1981. Enclosed is our final report.
If you have any questions, please get in touch with D. L. Lambert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuclear Regulation and Safety Enclosua
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Mr. Victor Stello, Director (Enclosure)V Office of Inspection and Enforcement e,t g.g U.S. Nuclear Regulatory Commission A "J y Washington, DC 20555
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ENCLOSURE SEQUOYAH NUCLEAR PLANT UNIT 2 ENVIRONMEEAL QUALIFICATION OF CLASS 1E EQUIPMEE NCR'S SQNEEB8009 THROUGH 8015 AND 8019 10CFR50.55(e) REPORT FINAL REPORT Description of Deficiency The following NCR's pertain to Class 1E components for which documentation has not been located to establish their ability to operate in the ambient conditions (temperature, humidity, radiation, and/or pressure) for which they are required.
SQNEEB8009 - Pressure Switches PS-30-46 A&B, -47 A&B, 'and -48 A&B -
required to operate during a These pressure switches are,F and radiation doses of 5 x L0gA at temperatures of 135 10 rada.
SQNEEB8010 - Class 1E Motors - These motors are required to operate in various normal and postaccident environments. See A.
SQNEEB8011 - Solenoid Valve FSV-70 This solenoid valve must operate gt a temperature of 202 F, a radiation dose of 3.6 x 10 rads, and a relative humidity of 100 percent.
SQNEEB8012 - Solenoid Valves PSV-65-81 and PSV-65 These solenoig valves are required to operate in an environment of 150 F 7
and 7 x 10 rads.
SQNEEB8013 - I/P Transducers PDM-65-80 and PDM-65 These transdycers must operate in a pontaccident environment of 7 x 10 rads.
SQNEEB8014 - Portions of the Hydrogen Monitoring System mounted in the Annulus - These pogtions are reguired to operate in an environment of 150 F and 7 x 10' rads.
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l SQNEEB8015 - 1. DC Vent Fan Motor and Starter - This motor and agarter are required t perate in an environment of 104 F and 3
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less than 10 rads.
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l 2.AuxiliaryAirCompressorMotorandInstrumengRackis required to operate in an savironment of 115 F, a relative humidigy of 100 percent, and radiation dose j
of less than 10 rads.
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- 3. Pressurizer Heater Transformers are r1iquired to a
operate in a postaccident environment of 115 F, a relative humidigy of 100 percent, and radiation dose of less than 10 rads.
- 4. Pressurizer Heater Distribution Cabinet CVRL,F, a is required to operate in an envipnment of 115 radiation dose of less than 10 rads, and a relative humidity of 100 percent.
- 5. Turbine-Driven Auxiliary Feedwater Temperature Instrument Panel ig required to operate in an environment of 125 F, a relative humidity of 100 3
percent and a radiation dose of less than 10 rads.
- 6. A/C Circulation Pump Motors E1 734 are requirgd to operateinanpostaccidentenvgronmentof115F,a radiation dose of less than 10 rada, and a relative humidity of 100 percent.
- 7. Solenoid Valve FSV-81-12 is required to operate in an environment of 110 F, a relative hugidity of 100 percent, and a radiation dose of 10 rads.
- 8. Rotark MOV Model 7A/1RP is requfred to operate in a postaccident environment of 115 F, a relative humidigy of 100 percent, and a radiation dose of less than 10 rada.
- 9. 6900V RCP PT and Relay Boards 1 and 2 are required to operate in an environment of 115 F, a relative humidity of 100 percent, and a radiation dose of less than 10 rads.
SQNEEB8019 - Class 1E electrical cables with either high or low density polyethylene insulation, which are located in areas subjected to high energy line breaks outside primary containment (nodes 2, 5,10, and 17), are not qualified to the accident environment profiles defined for these areas.
Safety Implications These components perform critical safety functions that are necessary for the safe operation of the plant. Failure of one or more of these components during a LOCA condition could adversely affect the safety of the plant. Without the required environmental documentation, it is not known under what conditions one or more of these systems might fail.
Corrective Action SQNEEB8009 - The unqualified pressure switches on this NCR have taan repaired with new qualified parts, thereby making the switch assembly qualified for the accident environment.
SQNEEB8010 - Class 1E motors on contracts 72c38-92802, 72c38-83527, 76K35-83673-1, and 71c30-92695 have been qualified for a period of 5 years; contract 73c38-83532 for 2.5 years; and 71c30-92646 for 40 years. Replacement motors will be purchased and installed before the end of these time spans.
Motors on contract 72c33-29730 have been determined not to be class 1E equipment.
SQNEEB6011 - TVA has reevaluated the function of the solenoid valve and has determined that it does not perform a safety function when the harsh environment exists.
SQNEEB8012 - The solenoid valves have been replaced with qualified valves for units 1 and 2.
SQNEEB8013 - The I/P transducers have been relocated from the annulus to the control rod drive equipment room. The required room temperature and pressure for the environment in which the I/P transducers are located are well within the manufacturer's specifications. This justifies continued use of the devices; however, TVA will either type-test these devices or replace with type-tested ones before June 1, 1982.
SQNEEB8014 - The hydrogen monitors have been tested at a level which is less thag one order of magnitude below the accident dose of 5.6 X 10 rads. At the tested level, there were no failures. It is TVA's engineering judgment that the accident dose would not affect the operation of the hydrogen monitors; however, they will be tested by Wyle 7
Labs to a higher radiation level (1 X 10 rads) than the accident dose level. This information justifies continued use of the monitors.
SQNEEB8015 - 1. The do vent fan motor, although located in a harsh environment area, is required to function only during normal environmental conditions (Category C, per NUREG-0588). This motor is being replaced per the NUREG-0588 guidelines with a motor which is qualified for the normal environmental conditions.
It is TVA's engineering judgment that the de vent fan motor starter (Category C per NUREG-0588) is qualified for the environment condition which it is required to operate in. TVA performed an analysis during March 1981 to document this qualification.
- 2. The auxiliary air compressor motor has been qualified for a period of 2.5 years. A replacement will be purchased and installed before the end of that time span. The instrument rack has limited interim qualification. Because of the lack of proper documentation, certain relays in the instrument rack will be replaced with qualified ones before unit 2 fuel loading.
- 3. This equipment has been qualified by similarity to qualified components from the same vendor.
- 4. This equipment has been qualified by similarity to qualified components from the same vendor.
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' 5. An environmental qualification test for the turbine-driven auxiliary feedwater pump (including the electrical control equipment) was recently completed at Sequoyah. During this test, the pump was operated for approximately six hours with an ambient room temperature of 1250F.
Temperatures inside the turbine control enclosures stabilized at levels below the maximum component design temperatures, and the turbine maintained rated speed during the entire test. The radiation dose is negligible.
The vendor, Terry Turbine, has indicated that environmental qualification tests have been successfully performed on similar type equipment. Until the vendor qualification is received, the TVA test of this equipment at Sequoyah should serve-as the interim qualification. If for any reason final qualification cannot be obtained for this panel or any of the associated components, the unqualified component (s) will be replaced with fully qualified component (s) before June 1, 1982.
- 6. The A/C circulation pu,mp motors have been qualified for a period of 2.5 years.
- 7. The subject solenoid valve is required to operate within 10 seconds of a high energy line break. TVA has determined that the solenoid will perform its intended function before the manufacturer's temperature specification of 1400F is exceeded. This information justifies continued use of the device; however, due to the lack of documentation, TVA will replace it with a type-tested device before June 1982.
- 8. This component has been determined to be a "Limitorque" operator, for which adequate qualification documentation exists; therefore, it is qualified for the plant environment.
- 9. In the manufacturer's (International Switchboard Corporation) letter dated August 11, 1980 to TVA (EEB 800818 047), it is stated that it is the vendor's opinion that "this equipment can be qualified to IEEE 323-1974."
For this reason and the fact the radiation level is negligible and the temperature, pressure, and relative humidity are within the normal operating range of this type equipment, the equipment is satisfactory for continued safe operation while the proper documentation is being obtained.
SQNEEB8019 - TVA has determined that the low current loads on the cables will allow them to fbnction in the adverse environment without experiencing cable insulation damage.
The cables will, therefore, not require replacement.
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, ATTAbriNENT 1A
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'SEQUOYAH'C1 ASS IE MOTORS ON NONCONFORMANCE REPORT SQN EEB 8010 contract.
Component
'Integ. Accident 40 Yea'r, Environment' Spec. Require.
Dose 1 Year Normal Dose Temp /Ril Ambient / Rise Rads C'
-f. %
Cf C*
Rads 10k 43.3 30-80 40' 90 72C38-92802 Emer. Cas Treatment AllU Neg 0
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72C38-92802 Spent Fuel Pit. Pun p AllU
, Neg 10
~43.3 30 40 90 6
6 72C38-92802 RllR Pump. Cooler U.5 x 10 10 43.3 30-80 40 90
~ 6 6
, 72C38-92802 SIS Pump Cooler AHU
',5.6 x 10 10
- 43.3 30-80 40 90
~
6
-0 72C38-92802 Cent. Charing Pump Cooler AHU 6 '6 x 10 30 43.3 30-80 40.
90 6
72C38-92802 AFW &-Boric Acid Pump' AliU
.Neg
. 10 43.3 30-80' 40 90 0
72C38-92802 CCS Pump & AFU Pump AHU
.Neg 10 43.3 30-80 40 90 6
72C38-92802, Pipe Chase AHU.
. Neg 10 43.3 30-80 40
-90 0
6 72C38-92802 Cont. Spray Pump AHU 7.8 x 10 10 43.3 30-80
. 40 90 72C38-92802 Penetracion Room Coolers
_Neg l10 43.3 30-80' 40 90
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6
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.N. g '
10 43,3 30-80 40~
90 72C38-83527
. Aux. Bldg. Gas Treat. Fan e
6 72C38-83527-Emer. Cas Treat.' Fan.
' Neg 10 '
43.3 30-80 40 90 6
76K35-83673-1480-Volt Board Room-AHU
.Neg 10 46.1 30-80 40 90 Neg 46.1 30-80
'I40 70-71C30-92695: Comp. Cooling Water Pumps; Neg.
- d
'73C38-83532 Comp. cooling Water Booster Pumps Neg Neg 46.l' 30-80 40 90 6
6 Cont.
7.8 x 10 10 43.-3 30-80 40 90
, 71C30-92646..-
Spray Pumps.
7
~72C33-92730 Lower Compartment AliU 2 x 10.
49.8 98 65 90 2 x 10 48.'8 98
- 65 90 72C33-92730' CRD Mechanism AliU'
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