ML20236K608
| ML20236K608 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/15/1987 |
| From: | PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | |
| Shared Package | |
| ML20236K599 | List: |
| References | |
| NUDOCS 8708070187 | |
| Download: ML20236K608 (4) | |
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'O Evaluation of Insulated Blind Barrel Splices on Dual Voltage Motors In Limitorque Actuators Peach Bottom Atomic Power Station fua V 7-2 /- 8 Lead @ivision Responsible Engineer [
Prepared by:
Reviewed by:
[/ [x 7' 2 /- 7l Ledd Di, sion Independent Review
- //1/!87 Approved by:
Lead visio(BranchHea6 l
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SUBJECT:
Evaluation of insulated blind barrel crimp splices on 230/460 volt dual voltage motor windings.
REFERENCES:
1)
Limitorque Test Report B-0119 2)
Clarification of Information Related to the Environmental Qualification of Limitorque Motorized Valve Operators P004-EL3586-017 CONCLUSION:
Based on the following discussion, it can be concluded that the insulated blind barrel crimp splices on Limitorque valve actuators are qualified for their intended safety function at PBAPS Units 2 & 3.
j DISCUSSION:
MOV actuators at PBAPS Units 2 & 3 with dual voltage motors employ insulated blind barrel crimp splices to make winding connections.
These insulated splices are in the same product line as the crimp type lugs tested in Limitorque Test Program B-0119, Reference 1.
Thomas and Betts, Burndy and Hollingsworth are the crimp type lugs used to terminate motor leads during Limitorque
- testing, see Reference 2,
page 11 and 29,
" Clarification of Information Related to the Environmental Qualification of Limitorque Motorized Valve Operators."
The Reference 1 test profile envelopes the postulated environmental conditions at.
PBAPS Units 2 & 3.
The Limitorque test profile (Fig. 4) and the PBAPS primary containment LOCA profile (Fig. 14.6.11) are attached.
A comparison of these profiles demonstrates that the test profile is more severe than the PBAPS postulated accident profile.
Also, a pressure of 70 PSIG was coincident with a boric acid &
sodium hydroxide spray during the Limitorque testing.
With respect to the crimp splice integrity it is significant to note that this pressure would have forced the chemical spray into the limit switch compartment creating multiple conductive paths.
The insulated crimp lugs functioned successfully under these adverse chemical spray conditions, whereas these splices would not be exposed to a conductive chemical spray at PBAPS.
- Also, the tested Total-Integrated-Radiation-Dose (TID) of 204 megarads exceeds PBAPS TID of 33 megarads by more than 6 times.
At the conclusion of the Limitorque test B-0119, the following observations were made:
"The resistance across the crimp joint was measured with an ohm-meter as 0 ohms.
The integrity of the wire joint crimp was retained.
Surface cracks were noted on the terminal lug
. e insulation; however, all insulation remained intact."
The insulated terminals were periodically energized during the LOCA test as part of the power supply to the MOV.
This application of voltage occurred under simultaneous high pressure and chemical spray conditions, and the MOV operated successfully.
Class lE MOV's located in primary containment at PBAPS Units 2 & 3 have a maximum post LOCA operating time of 32 seconds.
Based on this short term operating requirement and the expected thermal lag associated with the internal limit switch compartment components, it can be concluded that the crimp connectors will not be er. posed to a harsh environment during the time period they must be operable and therefore are not susceptible to common mode failure.
Class lE MOV's located in secondary containment required for long term operation (101 days) under LOCA conditions are exposed to a maximum temperature of ll8*F and I
atmospheric pressure.
No chemical or water sprays are present in secondary containment.
Radiation is the only long term adverse condition which the crimp connectors would experience.
The Total-Integrated Dose I
(TID) post LOCA of 33 megarads is enveloped by the Limitorque tested TID of 204 megarads, Reference 1.
With the exception of a transient temperature of 165'F at atmospheric pressure, Class 1E MOV's required for short tem operation (1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />) post LOCA will basically be exposed to a mild environment. The long term radiation exposure would be reduced from a 101 day dose to a short term 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> dose. Although I hour has been conservatively used for EQ purposes, the actual operating times are 15 minutes or less.
The Class 1E MOV's in secondary containment required for long term operation under MELB conditions are exposed to a I
maximum temperature of led'F and a pressure transient of 2 PSIG over an eleven (11) second period.
Radiation is significantly less than the radiation exposure under LOCA conditions, approximately 25% of the LOCA dose.
Class lE MOV's required short term (1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />) for HELB conditions would be exposed to a short duration (several seconds) maximum temperature / pressure profile of 302'F and 10.4 PSIG.
The valves exposed to these conditions are isolation valves which operate within 1 minute. Due to this short operability requirement, it can be concluded that these valves will perform their intended safety function.
.,.- J Based on the operability requirements of Limitorque
~MOV's and the environmental conditions at PBAPS Units 2 3,
it can be concluded that the insulated blind barrel crimp splices are qualified for their intended safety function.
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