ML19351F793
| ML19351F793 | |
| Person / Time | |
|---|---|
| Issue date: | 12/30/1980 |
| From: | NRC COMMISSION (OCM) |
| To: | |
| Shared Package | |
| ML19351F792 | List: |
| References | |
| NUDOCS 8102200181 | |
| Download: ML19351F793 (5) | |
Text
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O ENCLOSURE PROPOSED CHANGES TO THE STANDARD TECHNICAL SPECIFICATION ELECTRICAL POWER SYSTEMS D.C. DISTRIBUTION - OPERATING LIMITING CONDITION FOR OPERATION 3.8.2.3 The following D.C. bus trains shall be energized and OPERABLE:
TRAIN "A" consisting of (250/125)-volt D.C. bus No. 1, (250/125)-volt lead battery bank No.1 and a full capacity charger.
TRAIN "B" consisting of (250/125)-volt D.C. bus No. 2, (250/125)-vol t lead battery bank _No. 2 and a full capacity charger.
TRAIN "C" consisting of'_(250/125)-volt D.C. bus No. 3 (250/125)-volt lead battery bank No. 3 and a full capacity charger.
TRAIN "D" consisting of _(250/125)-volt D.C. bus No. 4, (250/125)-volt lead battery bank No. 4 and a full capacity cnarger.
APPLICABILITY: MODES 1, 2, 3 and 4 ACTION:
a.
With one or more battery banks being inoperable as result of being outside -
of the 7 day or 92 day surveillance requirements, operation may proceed for up to 7 days providing that all of the following are met:
1.
The electrolyte in each cell is above the top of the plates and not overflowing.
2.
The average specific gravity of all the connected cells, corrected for temperature and electrolyte level, is not more than (2_0) points
(.020) below the manufacture's recomended full charge specific gravity (1.215) or the battery charging current is less than (2_)
amperes.
3.
The specific gravity corrected for tee,*Wture and electrolyte level of each connected cell, is no+ we than 20 points (.020) below the i.verage corrected valuc <f a 1 toe connected cells.
4.
The floa*
< age of each con. etus, ii, is greater than 2.07 volts.
Note:
(
) Indicates nominal values, with plant specific values to be supplied by applicant.
7102/00ltl:
. Otherwise restore the inoperable battery to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least HOT STANDBY within the next six hours and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />, b.
With one (250/125)-volt D.C. bus train inoperable, restore the inoperable bus train to OPERABLE status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or be in at least HOT STANDBY within the next six hours and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.
4.8.2.3.1 Each D.C. bus train shall be determined OPERABLE and energized at least once per seven days by verifying correct breaker alignment and indicated power availability.
4.8.2.3.2 Each (250/125)-volt battery bank and charger shall be demonstrated CPERABLE:
a.
At least once per seven days by verifying all of the following:
1.
The electrolyte level of each designated pilot' cell is above the minimum level indication mark and not more than 1/4" above the maximum level indication mark.
2.
The specific gravity of each designated pilot cell, corrected for temperature and electrolyte level, is greater than or equal to (1.200) or the battery charging current is less than (2_) amperes.
3.
The float voltage of each designated pilci cell is greater than or equal to 2.13 volts.
4.
The total battery terminal voltage is greater than or equal to (258/129)-volts on float charge.
5.
There is no evident physical damage to the battery, rack, or connections that would limit battery operability.
b.
At least once per 92 days and within seven days after a battery discharge [ battery terminal voltage below (220/110)-volts],
battery overcharge [ battery terminal voltage above (300/150) volts], or as a result of a pilot cell being outside of its seven-day surveillance requirement by verifying all of-the following:
1.
The electrolyte level of each connected cell is above the minimum level indication mark and not more than 1/4" above the maximum level indication mark.
2.
The average specific gravity of all connected cells, corrected for temperature and electrolyte level, is not more than 10 points (0.010) below the manufacturer's recommended full charge specific gravity (1.215).
. ELECTRICAL DOWER SYSTEMS SURVEILLANCE REQUIREMENTS 3.
The specific gravity. -'rrected for temperature and electrolyte level, of each connected cell is not more than 20 points (0.020) below the full charge specific gravity (1.215).
4.
The average electrolyte temperature of a representative number of connected cells is above the minimum temperature (60*F) for which the battery was sized.
5.
The float voltage, corrected for average electrolyte temperature, of each connected cell is equal to or greater than 2.13 volts.
6.
There is no visible corrosion at either terminals or connectors, or the connection resistance of these item (s) is less than (150x10-6) ohms, c.
At least once per 18 months by verifying all of the following:
1.
The cells, cell plates, and battery racks shcw no visual indication of physical damage or abnormal deterioration, 2.
The cell-to-cell and terminal connections are clean, tight, and coated with anti-corrosion material, 3.
The resistance of each intercell and terminal connection is less than or equal to (150x10-6) ohms, and 4.
The battery charger will supply at least (400) amperes at a minimum of (125/250)-volts for at least (8) hours.
d.
At least once per 18 months, during shutdown, by verifying that the battery capacity is adequate to supply and maintain in OPERABLE status all of the actual or simulated emergency loads for the design duty cycle when the battery is subjected to a battery service test.
e.
At least once per 60 months, during shutdown, by verifying that the battery capacity is at least 80% of the manufacturer's rathg when subjected to a performance discharge test. Once per i
60 month interval, this performance discharge test may be performed in lieu of the battery service test.
Annual performance test:: of battery capacity should be given to any battery that shows signs of degradation or has reached 85 percent of the service life expected for the application. Degradation is indicated when the battery capacity drops more than 10% of rated capacity from its average on previous performance tests, or is below 90% of the manufacturer's rating.
Page 1 of 2 ADDENOCM IEEE Batter? 'n'/G ELECTRICAL PCWER SYSTEM Comments on Battery D. C. DIS"'RIBU"'ICN - OPERATIN3 Tech Specs 10/26/50 Cc==ents ind Justification ACTION IEEE 450-1990 states that there is no great urgency about correcting any of the parameters listed in this section after it has strayed outside of the surveil-lance limits shown. Even though an excursion outside of the li=its should be corrected in a reasonable time frame in order to obtain maxinwa battery life.
none of the ite=s listed indicate an imminent battery failure or an appreciable loss of capacity.
(Except electrolyte below top of plates). The 7-day corree-tion time is very conservative as co= pared with the listed requirements in IEEE 450-1990 Section 4.4 a.1.
Electrolyte level above top of plates assures no physical damage to plates with adequate electron transfer capability. As long as electrolyte level does not resch overflow conditions the battery will be able to operate properly.
2.
An averase specific gravity of 20 points of all cells below recommended full charge value will not reduce capability more than about 6 ( of rating for a typical battery. This is considerably less than the safety margin pro rided in sizing.
Check manufacturer for specific values for the battery size and type to be used. The alternate use of a battery charging current to represent a value of state of battery charge can te used as described in IEEE 450-1950. Values of current to be used is a function of the battery type, size, age, float voltage, te=perature, and nominal specific Eravity.
3 As long as the average specific gravity is adequate, deviation of indi-vidual cells will not reduce the net capability of the battery. Under the maximum li=its provided in this ites and item 2 above, a cell could be as low as 40 points (0.Oh0) below the recom= ended full charge specific gra<ity.
A float voltage of a cell below 2.07 volts indicates a cell probles that 4
requires imnediate attention. See IIZE Std. 450-1990. Any float voltare above 2.07 but below 2.13 volts would indicate a need for an equalizing charge but would not cause any doubt about the ability of the battery to perform its design fuction. See IEEE 450-1960 Appendix C1.
.O'3 7E!LLAN_C_E_
a.1.
Operation of the battery will not be affected by electrolyte level if as demonstrated by the pilot cell the level is above minimum and not in b.1.
an overflow condition, a.2.
A specific gravity of (1,200) indicates adequacy to provide required b.2.
battery capacity. If mixing has not occurred to provide proper specific gravity readings, battery charcing current that has stabili7ed at a low t.3 value will indicate that the battery is charged (see comment above under Action-Item 2.).
An average level not more than 10 points below the
ADDE *D W.
page 2 of 2 ELEC3 ICAL PCWER SYSTEM IEEE 3attery W/G Comments on 3attery D. C. DISTRI3UTION - 0FERATING Tech Specs 10/2S/S0 recommended value for all cells indicates not more than ] percent decrease in capability. See IEEE h50-1980 Appendix 3.
Individual cell specific gravity readings (b.3. ) provides that even the low cells be close to full charge condition and when coupled with (b.2. )
provides for good operability.
a.3 A float voltage of 2.13 or above corrected for temperature indicates adecuate b.5 operability of the cell (s).
b.k.
An average electrolyte temperature 'above the minimum for which the battery was sired indicates adequate capacity as capacity increases as electrolyte temperature increases.
a.h.
A total battery terminal voltage greater than or ecual to on ficat indicates proper operation of the charger and when combined with a.2.
indicates that charging action is correct.
a.5 This is an added surveillance requirement which recognizes the e:phasis placed on the value of detailed physical inspection of the cells. See IEEE 450-1950, b.6.
Lack of visible corrosion or low D.C. resistance of the terminals and connectors under proper maintenance procedures indicates ability to handle high cischarge rates.
c.l.
" Abnormal" was added to differentiate from the normal deterioration as evidenced by deposit of material from the plates at the bottom of the jar of each cell which will occur over the 18-month period.
c.3 A nominal resistance value of intercell and connection resistances insure the adequacy of the battery to deliver the high short time requirements of its duty cycle.
e.
This requirement for a performance discharge test compares the battery capacity at that time with its rated capacity. As the battery is sired (in accord with IEEE Std. hS5-1978) with margins above duty cycle. the performance discharge test will always be = ore severe than the battery service test. Therefore there is no reason to perform a battery service test if the performance discharge test has been satisfactory. (As far as the battery is concerned).
The second paragraph of this requirement is taken directly from IEEE Std. h50-1930 and provides the user an indi-cation that he needs to check more often and start considering the need for a replacement battery as it approaches 857. of expected service life.
Expected service life reflects users experience, manufacturer's warranty, and is always equal to or greater than qualified life.