ML20155A806
| ML20155A806 | |
| Person / Time | |
|---|---|
| Site: | Portsmouth Gaseous Diffusion Plant |
| Issue date: | 10/21/1998 |
| From: | UNITED STATES ENRICHMENT CORP. (USEC) |
| To: | |
| Shared Package | |
| ML20155A798 | List: |
| References | |
| NUDOCS 9810290257 | |
| Download: ML20155A806 (20) | |
Text
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APPLICATION FOR UNITED STATES NUCLEAR REGULATORY COMMISSION CERTIFICATION PORTSMOUTH GASEOUS DIFFUSION PLANT USEC-02 REMOVE / INSERT INSTRUCTIONS Revision 25 Remove Pages Insert Pages VOLUME 1 LIST OF EFFECTIVE PAGES Pages i / ii Pages i / ii Pages ix / x Pages ix / x
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SECTIOP' 3.2 3.2-15 through 3.2-18 3.2-15 through 3.2-18 VOLUME 2 LIST OF EFFECTIVE PAGES Pages i / ii Pages i / ii Pages ix / x Pages ix / x VOLUME 4 LIST OF EFFECTIVE PAGES Pages il through iv Pages il through iv SECTION 2.1 2.1-20 2.1-20 None 2.1-20a 1/1 9810290257 981022 I PDR ADOCK 07007002 C
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SAR-PORTS October 21,1998
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Rev.25.
'O shows drawings of a typical single-hook crane and a sling and a typical double-hook crane and a sling.
3.2.1.1.5 X-343 Cylinder / Pining Evacuation It is necessary to evacuate small quantities of UF., purge gases, or lights from the sample system, autoclaves, pigtails or piping. This evacuation is accomplished by valving the system to be evacuated into a feed header or the X-333 evacuation line and returning these waste gases to the cascade. This method eliminates any venting to atmosphere and possible environmental insult.
3.2.1.1.6 UF, I_eak Detection System l
l The UF leak detection system in X-343 facility provides audible and visual alarms in the event that l
a UF, release occurs. Detectors are located over the autoclaves, on the Z-Header catwalk, and on the ground l
floor between the control panels for autoclaves 4 and 5. The detectors are grouped into ten alarm circuits (also l
referred to as " zones") with two detectors in each circuit except for two zones covering autoclave No. 7 which l
have only one detector per circuit. Activation of a single detector will activate an audible and visual alarm at the system control panel. The alarm is intended to notify operators that a UF. leak may have occurred in the building. Operators may disable individual alarm circuits using switches located on the panel.
3.2.1.2 X-342A Feed Vaporization Facility n
The X-342A Facility occupies the east portion of the large X-344A/342A complex and was the former
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primarj location for feed sampling and cascade feed vaporization. Another important function performed in the X-342A Facility is the manufacture of fluorine which is described in Section 3.4.7.
The X-342A Facility is equipped with two seven-foot diameter Feed and Sample Autoclaves identical in design and operation to the three Feed and Sample Autoclaves in X-343.
Ten-ton cylinders of UF. for customer orders are sometimes sampled in the X-342A autoclaves. Then the liquid-tilled cylinders are removed from the autoclaves and transferred to an adjacent " cool down" area.
When the cylinders have cooled for the required amount of time defined in Section 3.2.7 to solidify the UF.,
they are moved from the building.
l Directly beneath the X-342A autoclaves is a sump which receives autoclave condensate. The sump has two pumps which discharge through an oil interceptor to a storm drain. Since the geometry of both the sump and the interceptor are nuclearly unfavorable, they contain borosilicate-glass raschig rings as a nuclear criticality safety control.
If contamination of the sump results from a UF. release, the operator can shut off the pumps and close l
valves in order to prevent contamination of the drains.
3.2.1.2.1 Aufnclaves See 3.2.1.* 1.
The operation and safety systems are identical to X-343 Feed and Sampling Autoclaves.
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SAR-PORTS October 21,1998 h
Rev.25 3.2.1.2.2 Scales See 3.2.1.1.2.
3.2.1.2.3 UF, System Connectors and Associated Pining See 3.2.1.1.3 3.2.1.2.4 Cranes and Rigcing See 3.2.1.1.4 3.2.1.2.5 X-342A Evacuation System The X-342A Facility evacuates residual UF., purge gases and lights to the cascade through feed headers.
3.2.1.2.6 UF, Leak Detection System l
l The UF, leak detection system in X-342A facility provides audible and visual alarms in the event that l
a UF, release occurs. Detectors are located over the autoclaves, over the HF storage room, and inside the HF l
storage room. The detectors are grouped into three alarm circuits (also referred to as " zones") with two lg l
detectors in each circuit. Activation of a single detector will activate an audible and visual alarm at the system I
control panel. The detectors over the autoclaves and their associated alarm circuits are intended to notify operators that a UF. leak may have occurred in the building. Operators may disable individual alarm circuits using switches located on the panel.
l 3.2.1.3 X-344A Toll Enrichment Services Facility ne X-344A Toll Enrichment Services Facility is the processing and shipping / receiving point for low assay (5 % enrichment or less) toll product UF.. Typically, toll product is withdrawn from the enrichment cascade into 10-ton cylinders. Before the material can be shipped, it must be sampled and transferred into the smaller (21/2-ton) cylinders which are usually owned by the customers and are approved for transport over highways and railways. Special shipping packages are used to protect the full product cylinders in shipment.
He X-344A building has approximately 40,000 square feet of ground floor area,18,700 square feet of second floor, and 4,300 square feet of basement floor area. De majority of the ground floor is co,nsumed by the two high-bay areas which are served by overhead cranes and have large roll-up doors to allow entry of semi-tractor / trailer rigs, straddle carriers, forklifts, and railcars. Cool down positions are accessed by crane through the west side of the building.
The sampling and transfer operations are carried out in X-344A using aay of the four autoclaves prat in the north high-bay. Shipping and receiving activities can be carried out in either the north or south bay using any of the overhead bridge cranes. Cylinder unloading can occur outside the building in the X-745-B cylinder storage lot during good weather.
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SAR-PORTS October 21,1998 Rev.25 3.2.1.3.1 Autoclaves The four autoclaves located in X-344A are 96-inch, containment-type units with cylinder rolling and j
tilting devices to facilitate sampling and transfer of UF. contained in 12-inch,30-inch or 48-inch cylinders.
The autoclaves are rated at 150 psig. Figure 3.2-8 shows a diagram of a transfer autoclave servicing the 30-inch and 48. inch cylinders.
l 3.2.1.3.1.1 Autoclave Oneration With 10-Ton Cvl.nders A typical transfer operation consists of placing a 10-ton enriched product cylinder into an autoclave with the valve in the 12 o' clock position. The cylinder is lowered into place with the overhead crane positioning the cylinder on rollers. Once the cylinder is in position, an air-operated backup valve is attached to the cylinder valve and a copper pigtail is used to connect the backup valve to the UF. drain line which leads to the sample / transfer manifold outside the autocla've. The conductivity cells are tested. After the connections are leak-tested, the cylinder valve is opened, the cylinder cold pressure or vacuum is measured, the autoclave is closed, the steam is turned on, and the cylinder is heated for 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. At that point, the steam is turned off and evacuated from the autoclave. The UF vapor which was introduced into the UF, pressure monitoring circuit is evacuated to the cascade and the pigtail is loosened to allow rotation of the cylinder so the valve is at the 6 o' clock position. The "back" end of the cylinder is tilted upward slightly to allow for the valve to be positioned as low in the liquid UF level as possible. Tilting the cylinder allows for a liquid drain leaving only about 800-1000 lbs. of UF, in the 10-ton cylinder. Due to space limitations, some transfer requests result in i
l leaving about 1200-1500 pound " heels" in the 10-ton " parent" cylinder. After the cylinder has been rolled and
. tilted, the pigtail is tightened, leak rated, and the autoclave re-closed. The steam is turned on again to maintain J
the desired temperature of 220*F until the transfer is complete. The transfer will typically consist of filling 4
four 21/2-ton " daughter" cylinders from each 10-ton " parent" cylinder. Final sampling for customer acceptance is performed simultaneously with the transfer by withdrawing twc approximately 15C]-gram liquid samples and, in some cases, an additional smaller (usually 200 grams) sample. The sampling is effected by momentarily diverting the flowing UF from the transfer line into a sampling manifold which is calibrated to contain either 200 grams or 1500 grams depending on the size of the " sample loop" which was isolated by valves. 'Ihe flow to the 21/2-ton cylinder is resumed and the isolated quantity of UF, is then allowed to drain into an appropriate sample cylinder which is cooled with liquid nitrogen to assure total condensation of the sample quantity. The sample manifold and the UF drain line are enclosed in electrically heated housings, whereas the pigtails connecting the 21/2-ton and sample cylinders are wrapped with electrical heaters and insulated to prevent the UF from "freenag out" in the lines. The 21/2-ton cylinder rests on a scale while being filled to the 0.5 % weight tolerance (i25.0 lbs.) written into a typical contract for enriching services.
I Transfer operations a also conducted using 21/2-ton and 14 ton cylinders as parent cylinders. A transfer from one of these types of cylinders is similar to the operation described above with the exception that
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21/2-ton parent cylinders are completely isconnected from the autoclave manifold during roll and tilt.
5 One of the samples is sent to the X-710 Laboratory for chemical and isotopic analysis. The duplicate sample is retained for a time as a " referee" in case the need would arise to reanalyze the material. Customer P-10 tube samples are extracted from the X-710 Lab samples and sent, if requested by the customer, to an independent analyticallaboratory to verify the data supplied by the Portsmouth GDP L) 3.2-17 i
SAR-PORTS October 21,1998 Rev.25 laboratory. Discrepancies rarely occur between the Portsmouth GDP and audit firm analytical results; however, the " referee" sample may be used to resolve any such discrepancies. Most of the customers secure the services of an auditing firm which not only monitors the quality of the product but also monitors the quantity by observing the weighing operations performed by Feed and Transfer personnel.
The autoclaves are also typically used for sampling of 21/2-ton,10-ton or 14-ton cylinders without transferring the contents. Sampling is performed in a similar manner as described above except a small quantity of UF. is allowed to flow through the sample manifold to " flush" the system and is evacuated to the cascade. Flushing removes any traces of UF. deposited in the manifold during the prior operation. After the manifold has been flushed, the sample is taken. The autoclaves are also us d for sample dumping. Sample dumping consists of installing 5, 8, or 12-inch cylinders or a rack of sample bombs in the autoclave. The contents are then heated, liquified and transferred to a designated dump cylinder. In the case of sample bombs it i- 'm permissible to 9
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SAR-PORTS October 21,1990 Rev.25 install the sample bombs on the dump rack in the upright position vice inverted as when. dumping to a dump cylinder. Upright installation allows the sample bombs to be vaporized and evacuated directly'back to the cascade. The Cylinder Low Pressure Cut-Off System is not a Limiting Condition for Operation in this case because once line clarity is verified, evacuation is begun immediately, which prevents cylinder pressure from ever reaching 20 psia during the heating cycle. The need for the cylinder low pressure cut-off is eliminated by the presence of a continuous vacuum which prevents any pressure build-up as well as continuous operator monitoring during the evacuation process.
3.2.1.3.1.2 X-344A Autoclave Safety Systems The safety systems for autoclaves at X-344A are functionally the same as described for autoclaves in the X-343 Feed Vaporization Facility (see 3.2.1.1.1). The autoclaves are constructed according to Section VIII of the ASME Boiler and Pressure Vessel Code.
3.2.1.3.2 Scales See 3.2.1.1.2.
3.2.1.3.3 UF, System Connectors and Associated Eauioment See 3.2.1.1.3.
3.2.1.3.4 cr9nes and nigging g
See 3.2.1.1.4.
3.2.1.3.5 X-344A Evacuation System UFccontaimng gases from pigtail purging, cylinder evacuation and cylinder sampling are evacuated to the cascade via a tie-in to the X-342 PG tie lines.
3.2.1.3.6 UF, Leakage Detectors ne UF leak detection system in X-344A facility provides audible and visual alarms in the event that I
a UF, release occx s. Detectors are located in the north high bay over the autoclaves. The detectors are grouped into two alarm circuits (also referred to as " zones") with two detectors in each circuit. Activadon of a single detector will activate an audible and visual alarm at the system control panel, ne alarm is intended to notify operators that a UF leak may have occurred in the building. Operators may disable individual alarm circuits using switches located on the panel.
The Gas Evacuation Relay (GER) system is controlled by a network of manual alarm pushbuttons and relay control wiring located throughout the entire X-344 complex to initiate autoclave containment (all four) and shut down of building ventilation systems.
3.2.1.4 Side Feed Facilities Facilities are provided to allow introduction of various assays of UF. to the equivalent assar point in the isotopic cascade.
O The side feeding of UF. requires that the cyhnder temperature be elevated only slightly above 3.2-18 A
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1 TSR-PORTS October 21,1998 Rev.15.
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' ;O IV t
TSR-PORTS October 21,1998 Rev.25 SECTION 2.1. SPECIFIC TSRs FOR X-342, X-343, AND X-344 FACILITIES 2.1.3 LDLITING CONTROL SE'ITINGS, LDIITING CONDITIONS FOR OPERATION, SURVEILLANCES 2.1.3.11 Autoclave Smoke Detection System APPLICABILITY:
All Autoclase Operational Modes LCO:
Autoclave UF smoke detection systems shall be operable.
l 6
ACTIONS:
Note:
TSR 1.6.2.2(d) does not apply Condition Required Actions Completion Time A.
For the X-342 and X-344 A.1 Provide continuous immediately l
buildings:
smoke watch at l
affected area l
< 1 operable smoke detector OR l
alarm circuit covering the area A.2 Place all autoclaves 1 Hour above the autoclaves in the affected building in Mode VII l
B.
For the X:343 building:
B.1 Provide continuous Immediately l
smoke watch at l
< 1 operable str.:ke detectx c.'e:::darca l
alarm circuit covering the area OR l
above each autoclave pair (i.e..
l No. l and 2; 3 and 4; 5 and o)
~
and autoclave No. 7 B.2 Place affected 1 Hour OR autoclaves (s) in Mode VII
< 4 operable smoke detector heads (total) l O
2.1-20
TSR-PORTS October 21,1998 Rev.25 SECTION 2.1. SPECIFIC TSRs FOR X-342, X-343, AND X-344 FACILITIES 2.1.3 LIMITING CONTROL SE'ITINGS, LIMITING CONDITIONS FOR OPERATION, SURVEILLANCES 2.1.3.11 Autoclave Smoke Detection System (Continued)
SURVEILLANCE REQUIREMENTS:
Frequency Surveillance Semiannually SR 2.1.3.11.1 Test active smoke heads to ensure alarm indication will occur when smoke head is exposed to a simulated smoke condition.
BASIS:
In the event of a UF. release in the autoclave area a local indicator will sound notifying operating personnel that immediate investigation and action must occur. The smoke detection system and subsequent personnel actions will mitigate the consequences of any UF. release. The detection components used are ionization type fire detectors designed to detect not only smoke but invisible combustion products. Due to their operating principle these detectors will also actuate in the 7
i presence of steam and vehicle exhaust, etc. Therefore prompt investigation of the actuation source is required. This LCO ensures that at least one smoke detector alarm circuit, covering the area l
above each autoclave that is not shut down. is operable. For autoclaves in the X-343 building, an l
autoclave smoke detector alarm circuit is required to have at least one operable smoke detector l
head above each respective autoclave pair (i.e., autoclave No. I and 2; 3 and 4; 5 and 6) and l
above autoclave No. 7, in order to be considered operable.
l l
Additionally, a minimum of four (4) smoke detector heads (total) mounted on the ceiling are l
required to be operable in X-343 to alleviate any potential adverse effects on the smoke detector l
heads from wind inside the building when one or both crane doors are open. If this condition is l
not satisfied, the "affected autoclaves" referenced in Action B.2 encompasses all autoclaves in X-l 343.
l 1
Furthermore, a single smoke watch is adequate to implement Action B.1, regardless of how many l
autoclaves may be affected. Because of the physical layout of the autoclaves and the smoke j
detector heads in the X-342 and X-344 buildings, an autoclave smoke detector alarm circuit in l
either of these two buildings is required to have both smoke detector heads operable in order to l
be considered operable. Other smoke detectors (and their associated alarm circuits) located in these l
facilities but not physically above the autoclaves are not covered by this TSR and shall not be used l
to satisfy the LCO requirements [SAR Sections 3.2.1.1.6, 3.2.1.2.6, and 3.2.1.3.6].
l
.A L.).
2.1-20a
_